Inconsistent Testimonies

Exploration Stage: Palace of Justice
From: Mr. Black
Description: I read the testimony of the robbed gentleman. According to him, the thief dug a passage under the fence into the yard then entered the house. An oil lamp he used was found next to the dig. Come on, help me examine the lamp!
Completed: Thank you for helping examine the lamp. There are no traces of soil on it or any dirty prints. This contradicts the testimony of the victim. Wait a second, what’s his name? I know him - that’s the defendant’s fiancee’s father, a wealthy citizen!