The April 2003 issue of SWAT (magazine) had a piece about airsoft for training.
A friend of mine in the US also help set up a LE training facility which uses airsoft. I know they did something with Bail Enforcement. He's doing "other work" now and I don't think he's still involved with that, but he still has some pics of the facility on a website.
I'm not going to post a URL publicly because of the incredible amount of fucktards we've been graced with lately, and the Spider/Archivability of these forums, but I can PM it to you if you want.