I was there when a USCG Reserve pilot was arrested for cooperating with the drug smugglers...great guy right up to that point...
One mistake in choosing who to associate with or trust can lead to nothing but tragedy. My father had a client who went into a hotel purchase with someone he shouldn't have. On a Friday he drove to the airport to fly to discuss the money he was owed. The next time he was seen was about 3 months later when he floated to the surface of a lake as the water warmed for spring. He was wrapped in drapes from a hotel and chain (perhaps this belongs in the rode discussion) but his body wasn't punctured so up he came.
A lot of business people in South Florida have gotten pulled in by a loan for their business or an investor in it.
One of the real quandary's people can face in life is to witness something illegal. Are you comfortable enough law enforcement can protect you to go to them?