Detective Conan S01 E442 The Man Obstructing the Steel Frame

"One truth prevails."

A struggling artist named Daijirou Manaka is nearly killed by a falling I beam. While he's lying in the hospital Takagi and the Detective Boys go through his bag and find his license, a rope, a pair of gloves, and a suicide note. Daijirou wakes up and when Takagi asks him about the bag he claims to have amnesia, but Conan notices he is lying.