What can be done to expose someone for making false claims to obtain business?

Someone who has been a personal trainer for a while is claiming that he was the overall winner in AAU bodybuilding show in 1996. He uses this information to obtain clients. How can he be exposed to his employer so he can be stopped?What can be done to expose someone for making false claims to obtain business?
Who WAS the AAU champ?What can be done to expose someone for making false claims to obtain business?
provide them with proof. If you don't want it to come directly from you, mail it to a specific anonymously. Or put the proof in an envelope with a specifics person s attn: and put it on their desk or put it with the mail that comes into the company on a daily basis.