I try not to think about it as having your patient steal from you is not a good thing for a doctor-patient relationship. It is worse though when you catch the patient redhanded. I had patient say, "oh, I though they were disposable" even though they were not used and were not needed for the reason that they were there. From what we can tell, there does not seem to be any demographic difference between who steals from us and who does not.
The latest is that a patient was caught trying to steal the blood pressure machine, the problem was that it was bolted to the wall. She had three of the bolts out when I walked in.