Copper Thieves = Scum of the Earth

After looking at so many properties that have been hit by copper thieves over the years, I have started to have this recurring fantasy about catching them in the act.  I have personally had several rentals broken into, but I have never been able to catch anyone red-handed.

Any investors out there that have been fortunate/unfortunate enough to catch someone in the act?  What did you do and how did it turn out?