This was my exact thought too. In fact, I would go out of my way to fabricate a tiny but measurable percentage of the data, just to see what I could convincingly fake and to give me plausible deniability for any of the real stuff, just in case. In the event that I ever found it necessary to do something shady for whatever reason, I'd have a lot of practice masking it.

...Or maybe I've also just watched too many spy movies.