Inconsistent testimony

Exploration Stage: Palace of Justice
From: Mr. Black
Description: I read the testimony of a man who was the victim of a theft. According to him, the thieves entered the yard through a passageway they dug under the fence and then entered the house. The oil lamp the man was using was found near the tunnel. We'll check out that lamp right away!
Completed: He was very helpful in accompanying me to inspect the lamp. There is absolutely no trace of dirt or soil on the lamp. This contradicts the victim's testimony. Wait a minute, this name! I recognize this name. He's the father of the defendant's fiancée, a wealthy resident!