Opinion: A Caste by Conviction: How Drug Law Structures Inequality in Aotearoa

In 1971, US President Richard Nixon declared drugs “public enemy number one.” What followed was the War on Drugs—a campaign built on a simple idea: that harsh punishment could eliminate drug use.

It didn’t. But the way it framed drug use as something to criminalise continues to influence much of Western drug policy, including Aotearoa’s.

The Misuse of Drugs Act 1975 frames drug use primarily as a criminal issue, rather than a health one. The consequences are severe. Supplying a Class A drug can carry life imprisonment—the same maximum penalty as murder. That equivalence is telling. It shows how the law understands drug offending: as a reprehensible harm to society that must be punished at the highest level.

The Act also reshapes the rules of guilt. If someone is found with a certain quantity of drugs, the law presumes intent to supply. The burden shifts. Instead of the state proving intent, the individual must disprove it. In practice, this sits uneasily with the principle that people are innocent until proven guilty.

Taken together, these features reflect more than just “tough” policy. They reflect a system built on deterrence, punishment, and control. This is what the War on Drugs was all about: reducing drug use and dealing by imposing harsh criminal penalties.

But the question does not end with what the law is. It is important to consider how the law is applied. Who benefits from this law, and who is being systemically disadvantaged from this policy.

Laws do not enforce themselves; people do. Police decide who to stop, who to search, and whether an offence results in a warning or a charge. That discretion matters most in low-level drug offending, where the same conduct can lead to very different outcomes.

Those differences are not random.

Around half of New Zealanders will use cannabis in their lifetime. Yet in 2022, Māori made up 45% of cannabis possession charges and 49% of convictions, while representing only 17% of the population.

That disparity cannot be explained by use alone. Rather, it reflects how this law is enforced.

When discretion is exercised unevenly, certain groups are more likely to be stopped, searched, and charged. That increases the likelihood of conviction. And once that conviction is recorded, its effects extend far beyond a prison sentence.

A drug conviction follows you. It narrows employment opportunities. It restricts access to housing. It makes financial stability harder to achieve. Each consequence may appear limited on its own, but together they accumulate, shaping a person’s long-term position in society.

This is how hierarchy forms: through a pattern of perpetual disadvantage. One group is more likely to be policed, more likely to be punished, and more likely to carry the enduring weight of that punishment.

Over time, those patterns harden. They begin to determine who has access to stability, opportunity, and security—and who does not.

That is what makes the system caste-like. It is not simply unequal treatment in isolated moments. It is the way those moments compound, producing durable social divisions.

This dynamic is more visible in the United States, where drug policy has disproportionately targeted Black communities. There, a conviction often carries the label “felon”—a status that limits access to housing, employment, and in many states the right to vote. It marks a person as permanently lesser in the eyes of the law.

Aotearoa is not identical, but the mechanism is recognisable.

When criminal law disproportionately targets certain groups, and attaches long-term social and economic consequences to that targeting, it does more than punish behaviour. It reshapes social position.

That is when policy becomes social structure.

In that sense, Aotearoa’s drug law cannot be understood as neutral. It operates within a broader history of colonisation—one in which legal systems have repeatedly been used to control, marginalise, and disadvantage Māori. Punitive drug policy does not sit outside that history, but continues it.

But it does not have to be this way.

One of the most enduring legacies of the War on Drugs is the assumption that punishment is the default response—and that anything else is soft, naïve, or radical.

It isn’t.

We have spent more than fifty years testing the punitive model. Drug use has not disappeared. Harm has not been eliminated. Instead, we have seen the opposite: rising overdose deaths, persistent addiction, and widening inequality. The system has not failed because it was not harsh enough. It has failed because punishment was never capable of solving the problem it set out to address.

Other approaches exist—and they work.

In 2001, Portugal decriminalised all drugs, shifting drug use out of the criminal justice system and into the realm of public health. Possession no longer leads to prosecution. Instead, individuals are referred to dissuasion panels made up of health and social service professionals. The response is not prison, but support: counselling, treatment, and community-based interventions (where appropriate).

The results are instructive. Drug-related deaths have fallen. HIV transmission rates have dropped. Levels of substance abuse use have declined. At the same time, the burden on the criminal justice system has eased, allowing resources to be redirected elsewhere.

Portugal did not eliminate drug use. But it did reduce harm, and that is the point.

Drug policy is not fixed; it is a set of choices about what we prioritise, who we punish, and what outcomes we are willing to accept. If those choices are producing predictable harm and inequality, they are not neutral. They are decisions of what society is willing to accept.

And decisions can be remade.

More than fifty years on from the declaration of the War on Drugs, the evidence is no longer uncertain. We know what punitive policy produces. We know what alternatives can achieve.

The question is no longer whether change is possible; it is whether we are willing to choose it.