Han Hui Hui and others v Attorney-General [2022] SGHC 141

Case Details

• Citation: [2022] SGHC 141
• Court: General Division of the High Court of the Republic of Singapore
• Decision Date: 16 June 2022
• Coram: Dedar Singh Gill J
• Case Number: Originating Summons No 1313 of 2021
• Hearing Date(s): 18 April 2022
• Claimants / Plaintiffs: Han Hui Hui; Sng Su Hui; Yeo Sheau Yuen; Lim Beng Kwang; Lawrence Simon Anthony; Muhammad Faizal bin Mustafa
• Respondent / Defendant: Attorney-General’s Chambers
• Counsel for Claimants: Lim Tean (Carson Law Chambers)
• Counsel for Respondent: Kristy Tan SC, Ho Jiayun, Jean Goh and Lim Toh Han (Attorney-General’s Chambers)
• Practice Areas: Administrative Law; Judicial Review; Constitutional Law

Summary

In Han Hui Hui and others v Attorney-General [2022] SGHC 141, the General Division of the High Court addressed a high-profile challenge to the Singapore Government’s COVID-19 management policies. The Applicants, six individuals who remained unvaccinated by choice, sought leave to commence judicial review proceedings against two specific measures: the "Unvaccinated Medical Bills Policy" and paragraph 7(c) of the "Updated Advisory on COVID-19 Vaccination at the Workplace" dated 23 October 2021 (the "October Advisory"). The former policy stipulated that COVID-19 patients who were "unvaccinated by choice" would be responsible for their own medical bills in public hospitals, while the latter provided guidance to employers on handling employees who could not enter the workplace due to their vaccination status, including the possibility of termination as a last resort.

The core of the dispute lay in whether these executive actions were susceptible to judicial review and, if so, whether they met the threshold of "reasonable suspicion" regarding illegality, irrationality, or unconstitutionality. The Applicants argued that the policies were discriminatory under Article 12(1) of the Constitution and were based on flawed statistical premises regarding the efficacy of vaccines and the strain placed on the healthcare system by unvaccinated persons. They contended that the Government’s "efficacy rationale" and "resource rationale" were factually incorrect and that the measures were an attempt to coerce vaccination through financial and employment-related penalties.

Dedar Singh Gill J dismissed the application in its entirety, finding that the Applicants failed to clear the procedural hurdles for leave. The court held that the challenged measures were policy decisions within the executive’s discretion and did not suffer from any arguable legal or constitutional infirmity. Crucially, the court affirmed that the executive is entitled to differentiate between groups (vaccinated vs. unvaccinated) where there is a rational nexus between the differentiation and a legitimate state objective—in this case, the preservation of healthcare capacity and the mitigation of public health risks. The judgment serves as a significant restatement of the court's role in reviewing executive policy during a national crisis, emphasizing the doctrine of separation of powers and the high threshold required to establish Wednesbury unreasonableness in the context of complex scientific and socio-economic data.

The decision also clarifies the application of Article 12(1) in the context of administrative acts. The court determined that vaccinated and unvaccinated persons are not "equally situated" given the differing risks they pose to the healthcare system. Consequently, the differential treatment complained of did not constitute a breach of the equal protection clause. This case reinforces the principle that while the executive's power is not unfettered, the courts will not interfere with policy choices that are supported by a logical, evidence-based framework, even if those choices are subject to intense public debate.

Timeline of Events

1. 22 January 2020: The Multi-Ministry Taskforce (MTF) is established to coordinate the whole-of-Government response to the COVID-19 pandemic.
2. 25 January 2021: The national vaccination programme commences in Singapore.
3. 1 May 2021: The Government announces that it will continue to foot the full COVID-19 medical bills for all Singaporeans, Permanent Residents, and long-term pass holders.
4. 24 June 2021: The MTF outlines a roadmap for Singapore to transition towards a "COVID-resilient" nation.
5. 21 October 2021: The MTF announces the introduction of Workforce Vaccination Measures (WVMs) to protect employees and the community.
6. 23 October 2021: The Tripartite Partners (MOM, SNEF, and NTUC) issue the "Updated Advisory on COVID-19 Vaccination at the Workplace" (the October Advisory).
7. 8 November 2021: The Government announces the "Unvaccinated Medical Bills Policy," stating that those unvaccinated by choice will be charged for COVID-19 treatment from 8 December 2021.
8. 30 November 2021: The Applicants’ solicitors send a letter of demand to the MTF and the Ministry of Health (MOH) challenging the policies.
9. 4 December 2021: The MOH and the Ministry of Law respond to the letter of demand, maintaining the legality of the measures.
10. 8 December 2021: The Unvaccinated Medical Bills Policy officially takes effect.
11. 27 December 2021: The Applicants file Originating Summons No 1313 of 2021 seeking leave for judicial review.
12. 1 January 2022: The Workforce Vaccination Measures (WVMs) take effect, restricting unvaccinated employees from entering workplaces.
13. 18 April 2022: The substantive hearing for the leave application is held before Dedar Singh Gill J.
14. 16 June 2022: The High Court delivers its judgment dismissing the application.

What Were the Facts of This Case?

The dispute arose against the backdrop of Singapore's evolving strategy to manage the COVID-19 pandemic. From the outset, the Government, through the Multi-Ministry Taskforce (MTF), implemented various public health measures, including border controls, contact tracing, and safe management measures. Central to the strategy was the national vaccination programme, which aimed to achieve high population coverage to reduce the incidence of severe illness and death, thereby preventing the healthcare system from being overwhelmed. By late 2021, while a vast majority of the population was vaccinated, a small but significant minority remained "unvaccinated by choice."

The first impugned measure was the "Unvaccinated Medical Bills Policy." Since the start of the pandemic, the Government had fully subsidized the medical bills of COVID-19 patients in public hospitals. However, on 8 November 2021, the Government announced that from 8 December 2021, this "special arrangement" would cease for those who were eligible for vaccination but chose not to take it. These individuals would instead be subject to the standard healthcare financing framework, which includes government subsidies (such as MediShield Life and MediSave) but requires the patient to bear the remaining costs. The Government justified this shift on two primary grounds: the "efficacy rationale" (vaccines are effective in preventing severe illness) and the "resource rationale" (unvaccinated persons disproportionately consume healthcare resources, such as ICU beds).

The second impugned measure was paragraph 7(c) of the October Advisory. This advisory was issued by the Tripartite Partners—comprising the Ministry of Manpower (MOM), the Singapore National Employers Federation (SNEF), and the National Trade Unions Congress (NTUC). It provided guidance on the implementation of Workforce Vaccination Measures (WVMs). Under the WVMs, effective 1 January 2022, only vaccinated employees (or those who recovered from COVID-19) were permitted to return to the workplace. Paragraph 7(c) addressed the situation where an unvaccinated employee’s work could not be performed from home. It suggested that as a "last resort," employers could terminate the employment of such individuals with notice, in accordance with the employment contract, if no other arrangements (like redeployment or no-pay leave) were feasible.

The six Applicants were Singapore citizens who had chosen not to be vaccinated. They alleged that these policies were not merely public health measures but were punitive and coercive. They presented statistical evidence to argue that the Government’s reliance on vaccination as a means to protect the healthcare system was misplaced. Specifically, they pointed to data suggesting that vaccinated individuals could still contract and transmit the virus, and that the absolute number of vaccinated persons hospitalized was sometimes higher than that of unvaccinated persons. They further argued that the October Advisory effectively authorized "wrongful dismissal" and that the Medical Bills Policy was an "illegal" departure from the Government's previous commitment to cover all COVID-19 costs.

The Respondent, represented by the Attorney-General, contended that the application was a challenge to policy decisions that were not susceptible to judicial review. They argued that the policies were based on a rational assessment of scientific data and were necessary to ensure the sustainability of the healthcare system. The Respondent emphasized that vaccination remained voluntary, but that the choice to remain unvaccinated carried consequences in terms of risk and resource consumption, which the Government was entitled to address through policy differentiation. The Respondent also challenged the Applicants' standing and their interpretation of the statistical data, asserting that the "rate" of severe illness among the unvaccinated was significantly higher than among the vaccinated, regardless of the absolute numbers.

What Were the Key Legal Issues?

The court had to determine whether the Applicants met the three-stage test for the grant of leave to commence judicial review proceedings under Order 53 of the Rules of Court. This required an assessment of the following issues:

• Susceptibility to Judicial Review: Whether the Unvaccinated Medical Bills Policy and the October Advisory were "decisions" or "acts" of a public body that were susceptible to the court's supervisory jurisdiction. This involved analyzing whether the measures had a sufficient legal effect or were merely non-binding policy statements.
• Sufficient Interest (Locus Standi): Whether the Applicants had a "real interest" in the matter, as required by the test in Tan Eng Hong v Attorney-General [2012] 4 SLR 476. The court had to decide if the Applicants were personally affected by the policies in a way that distinguished them from the general public.
• Reasonable Suspicion of Illegality, Irrationality, or Procedural Impropriety: Whether there was an arguable case that the executive had acted beyond its powers (illegality) or reached a decision so outrageous that no sensible person could have arrived at it (Wednesbury irrationality).
• Constitutional Validity under Article 12(1): Whether the policies breached the right to equal protection by discriminating against unvaccinated persons. This required the court to apply the "reasonable classification" test to determine if the differentiation was based on an intelligible differentia and had a rational nexus to the policy objective.
• The Nature of the October Advisory: Specifically, whether an advisory issued by "Tripartite Partners" (which includes non-governmental bodies like SNEF and NTUC) could be the subject of judicial review against the Attorney-General.

How Did the Court Analyse the Issues?

The court’s analysis began with a restatement of the principles governing the leave stage for judicial review. Citing Syed Suhail bin Syed Zin v Attorney-General [2021] 1 SLR 809, the court noted that the threshold is low—the applicant only needs to show a "very slight" or "modest" case to establish a "reasonable suspicion" of grounds for review. However, the court also emphasized that this threshold is not non-existent and serves to protect public bodies from groundless harassment, as noted in Lee Pheng Lip Ian v Chen Fun Gee and others [2020] 1 SLR 586.

1. Susceptibility and the Nature of the Measures

The court examined whether the October Advisory and the Medical Bills Policy were susceptible to review. The Respondent argued that the October Advisory was merely "guidance" and did not have the force of law. The court, however, took a nuanced view. While acknowledging that the Advisory was not a statutory instrument, the court noted that in the context of administrative law, the label "advisory" is not dispositive. If an advisory has the practical effect of directing the conduct of public or private actors in a way that affects legal rights, it may be susceptible to review. However, the court ultimately found that the October Advisory was a statement of policy rather than a "decision" that quashed or created legal rights. Regarding the Medical Bills Policy, the court found it was a policy decision regarding the allocation of public funds, which is generally a matter of executive discretion.

2. The Rationality Challenge: Efficacy and Resource Rationales

The Applicants’ primary attack was on the "rationality" of the policies. They argued that the Government’s reliance on vaccination was irrational because vaccinated persons could still be infected. The court rejected this, noting that "irrationality" in administrative law requires a showing that the decision is "so outrageous in its defiance of logic or of accepted moral standards that no sensible person... could have arrived at it" (the Wednesbury test). The court scrutinized the statistics provided by both parties. The Applicants focused on absolute numbers, but the court found this approach flawed. For instance, the court noted that as of 10 April 2022, while the vaccinated population was much larger, the rate of death and critical illness among the unvaccinated was significantly higher. The court observed:

"The Applicants’ focus on absolute numbers fails to account for the fact that the vaccinated population is vastly larger than the unvaccinated population. When one looks at the rates per 100,000, the efficacy of vaccines in preventing severe outcomes is clear." (at [102])

The court also addressed the "resource rationale." The evidence showed that unvaccinated patients, while a small percentage of the population, occupied a disproportionate number of ICU beds. For example, the court noted that at various points, unvaccinated persons (representing only about 4% of the population) accounted for over 50% of ICU cases. This provided a rational basis for the Government to implement measures aimed at reducing the burden on the healthcare system.

3. Constitutional Analysis: Article 12(1)

The court applied the "reasonable classification" test to the Article 12(1) challenge. This test requires: (a) the classification to be based on an intelligible differentia; and (b) the differentia to have a rational nexus to the object of the law. The court found that "vaccination status" was an intelligible differentia. The object of the policies was to protect the healthcare system and public health. Given the higher risk profile of unvaccinated persons (as evidenced by the 0.24% vs 0.03% death rates and other metrics), the court held that the differentiation was not arbitrary. The court cited [2022] SGCA 16 to emphasize that Article 12(1) does not require identical treatment for all, but rather that like should be treated alike. Since vaccinated and unvaccinated persons were not "equally situated" in terms of public health risk, the differentiation was constitutionally permissible.

4. Separation of Powers and Executive Discretion

A significant portion of the judgment was dedicated to the doctrine of separation of powers. The court cited Chng Suan Tze v Minister for Home Affairs [1988] 2 SLR(R) 525 to affirm that while all power has legal limits, the court must respect the "respective spheres of influence" of the different branches of government. The court held that decisions regarding the management of a pandemic and the allocation of healthcare subsidies are "polycentric" issues involving complex trade-offs that the executive is better equipped to handle. The court noted that it is not the function of the judiciary to determine which of several scientifically valid approaches is "best," but only to ensure that the chosen approach is not illegal or irrational.

5. Foreign Jurisprudence

The court considered several foreign cases cited by the parties, including R (Dolan and others) v SSHSC [2020] EWCA Civ 1605 and Minister for Immigration and Citizenship v Li (2013) 249 CLR 332. These cases reinforced the principle that courts should exercise restraint when reviewing executive decisions made in response to an emergency, provided there is a factual basis for the measures. The court found that the Singapore Government's approach was consistent with international norms in pandemic management.

What Was the Outcome?

The High Court dismissed the application for leave to commence judicial review and the application for declaratory relief. The court's findings can be summarized as follows:

• Dismissal of Leave: The court held that the Applicants failed to establish a "reasonable suspicion" that the Unvaccinated Medical Bills Policy or the October Advisory were illegal, irrational, or unconstitutional. The threshold for leave, while low, was not met because the Applicants' arguments were based on a "misconceived" interpretation of statistical data and a failure to recognize the breadth of executive discretion in policy-making.
• Declaratory Relief: Since the underlying grounds for judicial review were not made out, the court declined to grant the declarations sought. The court noted that declaratory relief is a discretionary remedy and would not be appropriate where the impugned acts were found to be within the legal powers of the executive.
• Costs: The court reserved the issue of costs for further submissions, following the standard practice in such applications.

The operative conclusion of the court was stated as follows:

"I dismiss the application." (at [185])

The practical effect of this judgment was to affirm the legality of the Government's "differentiated" approach to COVID-19 management. It confirmed that the executive could legally and constitutionally impose financial and workplace-related consequences on individuals who chose to remain unvaccinated, provided such measures were rooted in a rational public health objective. The judgment also effectively ended the Applicants' attempt to use the court as a forum to litigate the scientific merits of the national vaccination strategy.

Why Does This Case Matter?

This judgment is a landmark decision in Singapore administrative law for several reasons. First, it provides a detailed application of the "reasonable suspicion" threshold in the context of a national emergency. Practitioners can look to this case for guidance on how the court balances the low threshold for leave against the need to prevent "unmeritorious" challenges to essential government functions. The court’s rigorous analysis of the Applicants’ statistical arguments suggests that while the leave stage is a "filter," it is a filter with "teeth" when the challenge is based on a fundamental misunderstanding of the underlying data.

Second, the case is a significant contribution to Article 12(1) jurisprudence. By clarifying that "vaccination status" can be a valid basis for differentiation, the court has provided a framework for future challenges to public health or safety regulations that distinguish between groups based on risk profiles. The emphasis on the "equally situated" requirement is a crucial reminder that equal protection does not mean "same treatment" regardless of the circumstances. This has implications far beyond COVID-19, potentially affecting any area of law where the government must allocate limited resources or manage public risks.

Third, the judgment reinforces the doctrine of separation of powers in the Singapore context. Dedar Singh Gill J’s reliance on [2022] SGCA 16 underscores the judiciary's commitment to respecting the executive's role in "polycentric" policy-making. For practitioners, this highlights the "uphill task" (as the court put it) of challenging executive policy on the grounds of irrationality, especially when the policy is supported by expert data and scientific consensus. The court’s refusal to "second-guess" the MTF’s decisions reflects a high degree of judicial deference in matters of national security and public health.

Finally, the case addresses the status of "Tripartite Advisories." By entertaining the challenge to the October Advisory (even while ultimately dismissing it), the court has left the door open for judicial review of non-statutory instruments that have significant practical effects on the public. This is a vital area for administrative law practitioners, as "soft law" and "guidelines" are increasingly used by the Singapore Government to regulate various sectors. The judgment suggests that the court will look at the substance and effect of an instrument rather than just its form when determining susceptibility to review.

Practice Pointers

• Evidential Precision in Rationality Challenges: When challenging a policy on the grounds of Wednesbury unreasonableness, practitioners must ensure that their factual or statistical evidence directly addresses the "rate" or "probability" of the harm the government seeks to mitigate, rather than relying on absolute numbers which may be misleading in a large population.
• Pleading Article 12(1): To succeed in an equal protection challenge, it is not enough to show differential treatment. Counsel must be prepared to argue why the groups being compared are "equally situated" in relation to the object of the policy. If the groups pose different levels of risk, the challenge is likely to fail.
• The "Polycentric" Hurdle: Challenges to executive decisions involving the allocation of public funds or the management of complex socio-economic crises face a very high bar. Practitioners should focus on "illegality" (breach of statutory limits) rather than "irrationality" if possible, as the latter invites a high degree of judicial deference.
• Reviewing Advisories: Do not assume that because a document is labeled an "advisory" or "guideline," it is immune from judicial review. The court will assess whether the measure has a "sufficient public law element" and whether it practically affects the rights or obligations of individuals.
• Leave Stage Strategy: While the threshold for leave is low, an application that is "doomed to fail" on its merits will be dismissed at the leave stage. Practitioners must present a coherent legal theory that goes beyond mere disagreement with the policy's wisdom.

Subsequent Treatment

The ratio in Han Hui Hui has been consistently cited in subsequent Singapore decisions to illustrate the limits of judicial review in the face of executive policy-making. It stands as a key authority for the proposition that the court will not interfere with the executive's assessment of scientific data unless that assessment is demonstrably irrational. The case has also been referenced in discussions regarding the "reasonable classification" test under Article 12(1), particularly in the context of administrative differentiation. It remains a primary reference point for the "reasonable suspicion" threshold in Order 53 applications, reinforcing the "filter" function of the leave stage in the Singapore legal system.

Legislation Referenced

• Constitution of the Republic of Singapore, Article 12(1)
• Rules of Court, Order 53 r 1; Order 53 r 3
• Penal Code
• Social Care Act 2008

Cases Cited

• Tan Seng Kee v Attorney-General and other appeals [2022] SGCA 16
• Attorney General v Datchinamurthy a/l Kataiah [2022] SGCA 46
• Syed Suhail bin Syed Zin v Attorney-General [2021] 1 SLR 809
• Gobi a/l Avedian and another v Attorney-General and another appeal [2020] 2 SLR 883
• Lee Pheng Lip Ian v Chen Fun Gee and others [2020] 1 SLR 586
• Chng Suan Tze v Minister for Home Affairs and others and other appeals [1988] 2 SLR(R) 525
• SGB Starkstrom Pte Ltd v Commissioner for Labour [2016] 3 SLR 598
• Wong Keng Leong Rayney v Law Society of Singapore [2006] 4 SLR(R) 934
• Kang Ngah Wei v Commander of Traffic Police [2002] 1 SLR(R) 14
• Lines International Holding (S) Pte Ltd v Singapore Tourist Promotion Board and another [1997] 1 SLR(R) 52
• Re Dow Jones Publishing (Asia) Inc’s Application [1988] 1 SLR(R) 418
• Tan Seet Eng v Attorney-General and another matter [2016] 1 SLR 779
• Chee Siok Chin and others v Minister for Home Affairs and another [2006] 1 SLR(R) 582
• Tan Hon Leong Eddie v Attorney-General [2022] 3 SLR 639
• Ong Ah Chuan and another v Public Prosecutor [1979]–[1980] SLR(R) 710
• Ramalingam Ravinthran v Attorney-General [2012] 2 SLR 49
• Saravanan Chandaram v Public Prosecutor and another matter [2020] 2 SLR 95
• Wham Kwok Han Jolovan v Public Prosecutor [2021] 1 SLR 476
• Vellama d/o Marie Muthu v Attorney-General [2012] 4 SLR 698
• Manjit Singh s/o Kirpal Singh and another v Attorney-General [2013] 2 SLR 1108
• Tan Eng Hong v Attorney-General [2012] 4 SLR 476
• Comptroller of Income Tax v ACC [2010] 2 SLR 1189
• Nagaenthran a/l K Dharmalingam v Public Prosecutor and another appeal [2019] 2 SLR 216
• UKM v Attorney-General [2019] 3 SLR 874
• Council of Civil Service Unions and others v Minister for the Civil Service [1985] AC 374
• R (Dolan and others) v SSHSC and another [2020] EWCA Civ 1605
• Minister for Immigration and Citizenship v Li (2013) 249 CLR 332; [2013] HCA 18

Source Documents

• Original Judgment PDF (eLitigation)
• Case Details on eLitigation