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Find a Lawyer » Canada Legal Guides » Federal Criminal Law Canada » What Are ‘Structured Intervention Units’ (SIUs) in Canadian Prisons?

What Are ‘Structured Intervention Units’ (SIUs) in Canadian Prisons?

18 Jun 2026 3 min read No comments Federal Criminal Law Canada
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Canada officially abolished solitary confinement in federal prisons, replacing it with Structured Intervention Units (SIUs). Inmates in SIUs are legally entitled to at least 4 hours out of their cell daily, including 2 hours of meaningful human contact. Families can hire a lawyer to challenge unlawful placements.

For decades, administrative segregation (solitary confinement) was used in federal penitentiaries across Canada, from Millhaven in Ontario to Edmonton Institution. Human rights organizations successfully argued that isolating an inmate for 23 hours a day violated the Canadian Charter of Rights and Freedoms, causing severe mental health damage.

In response, the federal government passed Bill C-83, creating Structured Intervention Units (SIUs). ⚠ While the government claims this is not solitary confinement, many inmates still experience extreme isolation. Understanding the legal rights within an SIU and the strict review process is critical for any inmate or family member dealing with Correctional Service Canada (CSC).

The Step-by-Step SIU Placement and Review Process in Canada

Because SIUs are a federal creation under the Corrections and Conditional Release Act (CCRA), the rules are standard across the entire country. When an inmate is transferred to an SIU, a rigid timeline of mandatory reviews begins immediately.

Step 1: The Initial Transfer to the SIU

The Warden can authorize a transfer to an SIU if they believe the inmate poses a threat to the safety of the institution, is at risk from the general population, or if their presence interferes with an active investigation. 🚨 The inmate must be provided with the written reasons for the transfer almost immediately.

Step 2: The 5-Day Warden Review

Within 5 working days of the placement, the Warden must conduct a formal review. The inmate has the right to present their perspective, often submitted in writing. The Warden must decide if the safety concerns have been resolved or if the SIU placement must continue.

Step 3: Review by the Independent External Decision Maker (IEDM)

If the inmate remains in the SIU, their case is eventually escalated to an Independent External Decision Maker (IEDM) after roughly 30 days. 👤 The IEDM is not a CSC employee. They review the file to ensure the inmate is receiving their mandated 4 hours out of the cell and evaluate whether continued SIU placement is legally justified.

Step 4: Filing a Habeas Corpus Application

If CSC fails to provide the mandatory out-of-cell time, or if the confinement becomes unlawful and indefinite, a Canadian prison lawyer can file a Habeas Corpus application in the provincial superior court. This legal action forces the prison authorities to justify the detention to a judge, who can order the inmate’s release back into the general population.

How Much Does it Cost to Fight an SIU Placement?

Internal reviews are a standard part of the prison system, but taking legal action against CSC requires funding. 💰

Internal CSC Grievance$0 CADFiling complaints and participating in internal reviews is completely free.
IEDM Review Representation$1,000 to $2,500 CADCost for a lawyer to draft submissions to the Independent Decision Maker.
Habeas Corpus Litigation$3,500 to $10,000+ CADFiling a constitutional challenge in a provincial superior court.
  • Legal Aid Options: Inmates facing severe liberty restrictions in SIUs often qualify for Legal Aid assistance, depending on the province’s specific funding rules.

How Long Can Someone Stay in an SIU?

By law, there is no hard maximum time limit for an SIU placement. ⌛ However, CSC is under intense legal pressure to make placements as brief as possible. Most placements are resolved within 15 to 30 days, but complex security cases can unfortunately stretch into several months, triggering constant IEDM oversight.

Frequently Asked Questions (FAQ)

What counts as ‘meaningful human contact’?

The law requires 2 hours of meaningful human contact daily. This can include face-to-face time with psychologists, elders, chaplains, or interactive programming. Speaking to a guard through a meal slot does not legally count.

Do SIUs apply to provincial jails?

No. SIUs are strictly a federal concept under Correctional Service Canada for sentences of 2 years or more. Provincial remand centres and jails (sentences under 2 years) have their own administrative segregation rules.

Can an inmate refuse to leave their SIU cell?

Yes. If an inmate feels unsafe, they might refuse their daily 4 hours out of the cell. CSC must document these refusals and make daily efforts to encourage the inmate to participate in programs.

Can I visit my family member in an SIU?

Generally, yes. Inmates in SIUs retain their rights to visits, phone calls, and legal counsel, though physical movement inside the institution may be heavily restricted for security reasons.

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