What everyone can learn from the woman who lost $50,000 to a scam

[Generic Brad]

17. A modern twist on an old scam

"I am with the FBI, bank internal investigations, etc and we need your help catching a criminal teller who is short changing customers. The teller is suspicious of getting caught by law enforcement which is why we need a regular customer to step in. We need you to withdraw all your money and hand it over to Officer Scammer. Don't worry. It's safe. All the other customers in the bank are undercover agents who will have your back." Then you do the withdrawal, hand over the funds and are told by Officer Scammer and a Bank Investigator that the teller was caught and the Bank Investigator will put the money back into your account. They laud you as a hero. You saved the day. You think you stopped a criminal. Eventually you realize you were scammed and handed over your cash to thieves.

Variations of that are they find an excuse to threaten you with a bogus situation as described in the story above. But the commonality is to convince the victim to voluntarily turn over their cash to the scammer.