We all manage things differently but if your job depended on you making your timesheet accurate I bet you'd do it, especially if you'd had two warnings already.When I used to work in IT, like everyone else I had to deal with a lot of admin tasks not directly related to the core job - accounting for time, updating change management records, etc. None of these activities were difficult in themselves, and I don't think anyone questioned the importance of them, but some found them much easier to deal with than others. This doesn't reflect on intelligence or sense of responsibility - it's more about how your brain instinctively reacts in pressure situations.
So I have no difficulty imagining that some sports people are going to find it harder than others to keep their anti drug monitoring stuff 100% in order. Logically, the sort of person able to keep everything perfectly in line all the time ought to be better equipped to successfully cheat the system, so perhaps the Armitstead saga is focussing attention on the wrong person. I remember reading that when Heinrich Himmler was captured by the Allies, it was the completeness of his papers that first aroused suspicion.
And Himmler and Armstrong in the same thread is slightly mind warping.