It is now. It's based primarily on the synopsis prepared by the police at the time. Often, they're getting better at it. You'll have photocopies of the interview notes, and things of that nature, that show up right at the bail hearing. As a process issue, that gets done on a daily basis, the issue of whether or not the Crown's case is overwhelming, bulletproof, or weak, or whatever.
On May 1st, 2007. See this statement in context.