Hmm... no, it's not really the right place, but I'm not sure where is! I'll try moving this to Questions in the hope that some of those that populate that forum can help you.
You may well start by contacting the big private security firms - Securicor etc. They do have aviation security contracts, and I'm sure they would welcome ex-police officers. Otherwise, try a Google search for Aviation Security - that should give you a few clues.
Good luck!
Scroggs