What the evidence says about criminalising personal drug use

The global approach to controlling drug use has historically relied on criminalisation, treating the possession and consumption of controlled substances primarily as a law enforcement issue. In South Africa, substances such as psilocybin are classified under Schedule 7 of the Medicines and Related Substances Act, making unauthorised possession a serious criminal offence. However, over the past few decades, a growing body of public health research has examined whether punishing individuals for personal drug use actually improves societal outcomes or inadvertently worsens them. This has led to a global policy debate comparing the public health impacts of criminalisation against alternative models like decriminalisation.

The public health consequences of criminalisation

Criminalising personal drug use carries consequences that extend far beyond the criminal justice system, often creating significant barriers to public health. Research suggests that the threat of arrest and incarceration can deter individuals who use drugs from seeking emergency medical help during an overdose or from accessing voluntary treatment services. Furthermore, a criminal record can severely limit future employment, housing, and educational opportunities, pushing individuals toward social marginalisation—factors that are widely understood to worsen overall health outcomes.

The stigma associated with a criminal record often compounds the social isolation that frequently accompanies substance use disorders, making recovery more difficult. From a public health perspective, evidence indicates that allocating resources to arrests and prosecutions for simple possession yields limited benefits in reducing overall drug supply, while generating substantial social and economic costs that fall disproportionately on vulnerable communities.

Understanding decriminalisation models

When policymakers discuss decriminalisation, they are generally referring to the removal of criminal penalties for the possession of small quantities of drugs for personal use. It is important to distinguish this from legalisation, which would permit the regulated commercial sale of substances. Under decriminalisation, personal possession might still carry administrative or civil penalties, such as a fine, or it might be treated entirely as a health issue, involving referrals to education or treatment services.

The most frequently cited example of this approach is Portugal, which decriminalised the personal possession of all drugs in 2001. Under the Portuguese model, individuals found in possession of small quantities are evaluated by local health commissions rather than being arrested. Most cases are suspended or result in a recommendation for treatment rather than a criminal punishment, shifting the primary response from law enforcement to public health.

What the evidence says about usage and treatment outcomes

A primary concern raised by critics of decriminalisation is that removing criminal penalties will normalise drug use and lead to a significant increase in consumption. However, extensive reviews of the evidence by public health researchers generally indicate that decriminalisation does not lead to a surge in overall drug use. For instance, evaluations of Portugal's policy found that while some specific drug use patterns shifted, overall usage rates remained broadly similar to or lower than those in comparable countries that maintained criminal penalties.

Evidence also suggests that decriminalisation can improve access to health services. By removing the fear of criminal prosecution, individuals are often more willing to engage with healthcare professionals, seek voluntary treatment, and utilise harm reduction programmes. However, researchers note that decriminalisation is not a cure-all; its success in improving public health metrics often depends heavily on the simultaneous investment in robust, well-funded health and social support systems.

Lessons for South African policy

The global evidence on drug policy is highly relevant to South Africa's ongoing conversations about reform. Currently, the strict scheduling of substances like psilocybin under Schedule 7 places them alongside highly restricted drugs, meaning personal use is treated as a criminal matter rather than a health or privacy issue. The constitutional challenge regarding the private use of cannabis by adults provides a notable precedent for questioning the criminalisation of personal drug use in South Africa.

While psychedelic policy is evolving separately from cannabis policy, the underlying legal arguments regarding privacy and the right to make personal health decisions remain a central theme. As the global evidence base grows, public health advocates suggest that shifting resources from the criminal justice system toward health-centred approaches could reduce the harms associated with drug use, alleviate pressure on the legal system, and offer individuals a pathway to support rather than a criminal record.