"one would be looking for a more guaranteed information source than the company's servers"
I agree, but usually these problems appear over time. The first episode is minor and easily glossed over; the second - well, not minor but a one off, the third no worse than the first, the fourth... well, you're in quite a long way now aren't you? Have you written them all down? And you have a lawyer looking after you from that first, minor, who knows if this will ever be repeated, point?
If you start recording the first, you're a suspicious bastard well out of sight of the bell curve, and probably pesky enough that the company are looking to dismiss you anyway... (I say this in all admiration of those who are like this; I'm not as too gullible).