Dear Disco Lemonade,
I work with my best friend. I just found out that they are stealing from the company. What should I do?
Your Faithful Reader,
Yikes! Loyalty of your livelihood or loyalty to a friend... that is a doozy. I say blackmail your friend with the evidence you have on them. This is the perfect solution because you don't turn in your friend, you don't participate, but you still get something out of it.
P.S. Make sure not to leave a paper or electronic trail.
Your Humble Columnist,