Police Stops and Intellectual or Developmental Disabilities: What Families Need to Know

A police stop is stressful for almost anyone. New research published in 2026 in the Journal of Autism and Developmental Disorders finds that for adolescents with intellectual and developmental disabilities, the same encounter leaves a heavier and longer-lasting mark. Families have been saying this for years. The study puts numbers behind it.

What the 2026 study found

The researchers, led by Lindsey Webb, drew on a large national dataset of urban-born American youth and compared police stops, the features of those stops, and the stress that followed, between teenagers with and without intellectual and developmental disabilities (IDD). It is US data, not Canadian, so read it as a signal rather than a local statistic. The finding is more specific than “police are harder on kids with disabilities,” and the specificity is what makes it useful.

Youth with IDD were not significantly more likely to be stopped than youth without IDD. The difference showed up in what happened during and after a direct stop. Among teens who were directly stopped, those with IDD reported higher emotional distress during the encounter, and more police-related post-traumatic stress symptoms afterward, than their peers without IDD.

In plain terms: the stop was not necessarily more frequent, but it hit harder and it stayed. The authors are careful to call for policy reform, officer training, and more research to protect these young people’s wellbeing.

This is a single study, and it reports associations rather than proving cause and effect. We are reporting its findings, not stretching them past what the authors claim. But it lands in a body of Canadian and international work pointing the same direction.

Why the encounter goes wrong

The mismatch is rarely about bad intent. It is about a script that does not fit. Canadian research and clinical guidance describe a recurring pattern: an officer reads behaviour as defiance or evasion when it is something else entirely.

Avoiding eye contact can look like dishonesty. A slow answer can look like non-compliance. Repetitive movements, covering the ears, walking away from a loud and bright scene, these are often a person managing overwhelming sensory input, not a person resisting. Some researchers have gone so far as to ask whether behaviours labelled “difficult” in IDD and autism are better understood as adaptive responses to feeling unsafe.

One Canadian study, from the Centre for Addiction and Mental Health and York University with CAMH clinician-scientist Dr. Yona Lunsky, looked at police interactions involving people with autism. Physical restraint was used in about 19 per cent of encounters. The person was taken to an emergency department in about 30 per cent. Roughly half the time the police response had a calming effect. Close to a third of the time it did the opposite. And a separate Canadian survey of adults with autism found that much of the negativity in these encounters traced to police not knowing, going in, that they were interacting with a person with autism at all.

What families can ask of their local services

This is the practical part, and it is general information, not legal or medical advice. None of it shifts responsibility onto families to prevent harm that systems should be preventing. Several Canadian municipalities have tools that can lower the odds of an encounter going badly, and many families do not know they exist. Families can ask about them.

  • Vulnerable person registries (some services call them special needs registries). Many Canadian police services keep a voluntary registry where families can record a person’s diagnosis, communication needs, triggers, and what helps de-escalate. Families can ask whether their service has one, what it holds, and who can see it.
  • Identification tools. Some provincial autism organizations provide window decals, vehicle stickers, and shoe labels that signal a person may have a developmental disability. Families can ask what is available in their province.
  • Officer training. Families can ask their service, or their local police board, what autism and IDD-specific training officers receive and how often. A police board is a legitimate place for community members to raise this.
  • Crisis response options. Families can ask whether their community has mobile crisis teams that pair mental health professionals with police, or send them instead, and how to request that response.
  • A personal information sheet. Some families prepare a brief card describing the person’s needs and contacts, kept in a wallet or vehicle, that can be handed to an officer.

Registries and decals are not a fix. They put part of the work on families to flag a disability in advance, when the deeper change belongs with police services and policy. The study authors say as much: the call is for reform and training, not for families to compensate for a system that was not built for their kids. Still, while that larger change is pending, knowing what your municipality offers is worth the phone call.

If an encounter has already happened

The study’s most sobering finding is about the aftermath. Post-traumatic stress symptoms after a police stop ran higher for youth with IDD. The support a young person needs may not end when the encounter does.

If a police stop has left a young person in your family distressed, frightened of leaving the house, or showing signs of trauma, those reactions are real and worth taking to a qualified professional: a family physician, a psychologist, or a mental health service experienced with developmental disability. Several Canadian organizations, including provincial autism associations and disability-and-justice research networks, publish family resources on exactly this issue.

This article reports what the research found and what tools exist. It is not legal advice and not a substitute for a lawyer if a family is dealing with the justice system, or for a clinician if a young person is in distress. The point is narrower, and we hope useful: the harder impact on youth with IDD is now documented, the patterns behind it are known, and there are concrete questions a family can put to their local service today.

Related reading: late autism and ADHD diagnosis in adults.

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