Do your users take USB Flash Drive home with them? Are those drives encrypted? If not, they are taking a big risk when they get in the car.
Unsecured USB Drives are a big problem because:
A) Flash Drives get stolen from cars
B) Flash Drives tend to fall out of pockets in parking lots
These incidents are embarrasing and potentially expensive. Data breaches are increasingly subject to fines and penalties at the state and national level throughout North America and Europe.