I think that this kind of thing goes on more than we realise. Personally i knew someone that had a genuine license but it was issued on the basis of a lot of fake entries in his logbook. In fact he fabricated an entire flying career in the RAF! He got a job with an airline in the UK and it was 3 years before he was rumbled. This was only by chance as he was on a conversion course and a fellow trainee on said course had actually been on so and so squadron at the same time as this character was supposedly there. Of course the facts didnt fit. All that said however he passed every test, course, check etc he did and was to all intents and purposes a competent pilot. Safety was not an issue, just cheating the honest people. This is an extreme example but i have also known loads of people "round up" logbook entries, or make an "error" adding the times up!