This IS a very interesting topic. I have often thought about the purchase of a dash cam myself. I was also going to use it for personal reasons such as on my Harley while riding, or using it for training purposes for competitive canoe paddling. It would be something that I purchased and had TOTAL control over. The thought of having something MANDATED, whether by the government or a company, is totally disturbing to me. I agree with hawk that it crosses the line between IC and employee.
I can see pros and cons for both sides, but thinking about it I see more cons for drivers and pros for companies. Especially in regards to the driver cam. As illustrated in an earlier example, one little miss step by the driver and it would just put fuel on the fire in court. An example would be, say 20 seconds before an incident you reached over to change the channel on the radio. Lawyers would see that and say the driver was preoccupied with the radio and wasn't paying attention to the road. Even if it was 20 seconds prior. I don't care who you are, if you are driving 11 hours, you will take one hand off the wheel, look at your radio, light up a cigarette, talk on the CB, eat something, look at something outside the truck not related to driving, etc. All of which could be used against you in court.
Doing this for only "problem drivers?" First off if you have problem drivers? GET RID OF THEM!!! Oh but wait, there is a drivers shortage, we can't do that. Lets try to get the most out of these drivers but cover our arsses. Secondly, wouldn't that cross over into a discrimination area? Just say'n.
I have a feeling this is going to become a growing topic over the next few years. George Orwell was truly our modern day Nostradamus.