Yesterday at 12pm a neighbor of mine was pulling into his driveway, and saw that his van's back-window was shattered. Well, this neighbor and I have had some trouble with each other in the past (only noise complaints though) because he is in a band, and plays in his garage; however, it was not me who broke the glass on the van. As soon as he came home, he immediately marched across the street to me while I was exercising in my garage. Upon arrival he raises his voice, and presumptuously threatens to call the cops even though he had no idea who did it in the first place. I, being responsible, told him I did not do it, and will show him video evidence (I have a camera mounted above my garage). Since my camera covers nearly five houses, it can clearly see his house. So as I'm returning from the house with the USB at hand, a cop is walking towards me from his house, and my neighbor was pointing at me. Without any hesitation I told the cop I may have video evidence of who did it. He was interested in the footage, so without thinking twice he plugged it straight into his laptop (running windows XP), and there wasn't anything on it useful (the light just so happened to be at the right spot and the right time). So he simply returned the flash drive to me, and told my neighbor that he couldn't do anything about, regarding the evidence. The day ended there.
Nonetheless last night I sat up thinking about what had happened, and the fact he hates me. It didn't strike my attention, however, that the cop plugged the device into his laptop in his cop car, the one he uses on-duty. I just thought to myself... could this have been all a setup, and could have sensitive data been compromised?
Should an officer directly plug an "outside" USB device directly into their on-duty laptops?
If this is an issue, what security concerns does it raise, and what damage could this have caused?
Do most police officers receive training to prevent Social Engineering?
Also, sorry for the verbose story, but it helps to undertsand whats going on. I'm a student in Computer Science, but know only the basics of security (for programming). With this being a real life story that happened yesterday, I'd really like to understand the risk this may have produced for others.