Ideally, being able to capture the whole evaluation on video would be the way to go. As for the technology being there, I can't say it's not there. All you have to do is go to a movie theatre and you see what technology can do. But we certainly don't have those kinds of resources. Multiple cameras would be required, and you would have to have the manpower to operate them.
So realistically, it's not something that's feasible for police stations.