Logging hours not flown
As a corporate piiot, I see evidence of P51 time all the time, and while those pilots are out there, the real bastards are the people that hire them.
Not hard to tell honest flight time from bogus.
Remember:
Someone who logs say 200 hours of flight time is ripping you off one year of your flying experience.
They got the job you didn't.
They are misrepresenting thier experience and could kill someone
They are driving up the insurance rates
They are making pilots look dishonest.