This is a pretty curmudgeonly viewpoint, but one of my objections is that I simply don't trust people without MDs to operate radiological equipment. I mean, sure, in normal operations, there are some non-peer-reviewed studies suggesting that the total radiation dosage is negligible (and people somewhat rightly bring up the cosmic radiation point -- as part of my Department of Energy orientation, I was told that airline crews get some of the highest radiation exposure of any career), but as a computer scientist, the question that occasionally comes into my mind is: how would the average TSA agent actually know if their radiological equipment is operating normally?If the radiation dose is large, I can also see them being an issue (but I'm pretty sure it's not that bad.)