I thought it was a story where a boss caught his employee who're gambling during office hour, fix your title @OP to "Proof that gambling money may ruin any career when greed takes over".

I have few stories:
A police who ask for money for him in order to make people not getting traffic ticket.
An administration staff who buy a product for the company use manipulated bill in order to charge more.
A manager who ask money to every employees with a claim the company needs it, but the company never ask it.

Gambling can't be blamed here except the company/boss don't like to work with gamblers, that's it.