In the case you identified there, the police then would have discretion on what they're going to do with it. If there's a fine line whether or not that person should be charged with voyeurism, knowing the registry is there and knowing the person could be on the registry for x amount of time, the police have some discretion whether to lay a charge or a voyeurism charge.
The discretion would be the front line, right off the bat, and then they have to get past the crown attorney to lay that charge. They may not want to proceed at that point. So there are some steps they have to go through before that person gets to the actual conviction stage, to get them onto the registry.