Perhaps I can bring on the more general, and then Dr. Motiuk could maybe speak to how Correctional Services does it.
In general, with the assessment of risk, there are many ways of doing the assessment without the direct cooperation of the client. You can assess risk by collecting or gathering information from other sources, and not only criminal history, which obviously can be taken from police records, but other risk factors such as employment or substance abuse. You can collect the appropriate information by talking to the people who know this client.