How to Prove a Coworker is Lying About Overtime?

A question to Ask the Workplace Doctors about overtime abuse:

Question:
How to prove your colleague is wrongly getting overtime? I’m inquiring because my coworker has been putting unnecessary O/T for a while now. He is conducting normal business hours duties on overtime after not working for majority of the business days. There is a lot more to the story, but I would like to start with proving his overtime abuse. PS My manager told me my coworker works after hours but does not get paid for it and I really feel strongly that is false.

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