Pro-Net is now Electronic Tracking Systems. Here is their website:
http://www.etstracking.com/Part of the idea of these systems is deterrence. If you are a Blackhat, have been in custody, and even slept thru part Bank Robbery 101 then you know these systems exist.
How to defeat them and where they are is a different matter.
As a former user, I can assure you that the Pro-Net Technology was good. The new technology is far,far, far better and there is some really incredible stuff on the horizon. You are an idiot or want to get caught if you take on an institution with the current technology. With the new technology not yet rolled out it is really going to be a real problem for the badguys.
As background, PRONET was first deployed in California as a a non-lethal alternative to the exploding dye-pack given bank robbers up into the mid-80's. In particular, part of the motivation was from One darwin award winner who robbed the Wells Fargo at Market and Drumm/California, left the bank, shoved the dye pack down the front of his chinos and jogged down to the Embarcadero BART escalator at Market and Pine.
Just as he got on the escalator, the dye pack went off and blew one nut clean out of the bag and burned the other one beyond recognition. For along time after there was a orange stain on the escalator tread if you happened to get on that portion of the escalator tread.
He sued. He won. Alot. Like $750K- that was alot of money then (not shabby now but nothing to loose your head over so to speak). This jury award was one of the openings to sell this technology to Banks in California. That dye was a pain in the Azz anyway it really stained if you got it while it was still wet.
There was a story out of Southern California where a guy was killed when he put the pack in his ballcap and it went off. I was never able to substantiate that one- supposedly the bank settled out of court with the family who agreed to a non-disclosure.
Catching bank robbers- fun stuff.