Exploding dye packs?

I work at a 24 hour emergency clinic in a bad part of town. We’ve had a series of break-ins and thefts from employee cars and nothing is working to stop them. We’ve added more lighting to the parking lot and video cameras and recorders – the police are useless (our local police force solves a whopping 4% of property crimes).

I’d love to booby trap a purse or backpack with an exploding dye pack like the banks use but I can’t find them anywhere. (I admit it, it would give me an enormous amount of personal satisfaction – so I’m petty.)

Any ideas?