How to stop houses getting trashed pre move in.

[Dean Letfus]

Interested in any advice opinions on any strategies to stop houses getting vandalized post rehab and pre move in.
Seems to be a developing trend here in Memphis in good areas houses are being stripped of copper etc. We had 2 in a week where they took water heaters, left the water on and we have huge damage (and huge repair bills).
How do you slow the thieves down?