Since his April conviction, Chauvin has been held at the state’s only maximum security prison, in Oak Park Heights. That’s unusual — people don’t typically go to a prison while waiting for sentencing. Chauvin is there for security reasons. Most state prisons have a unit to separate inmates from the general population for safety or security. But Oak Park Heights has what the Department of Corrections calls Minnesota's “most secure” unit to separate individuals from others in the prison for disciplinary or security reasons.