A suspect claimed he spent all night reading a single book under the glow of a streetlamp outside his apartment. Detective Green looked at the suspect's clean, unblemished white shirt and immediately knew he was lying. Why?
Moths or bugs attracted to the streetlamp would have dirtied his shirt.
Reading under a streetlamp at night attracts swarms of insects, moths, and dust, which would leave a person's clothes dirty or covered in bugs.
About this riddle
Detective riddles are tiny mysteries. Look for the detail in the story that does not fit; it is usually the clue that solves the case.
Difficulty: Hard. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.
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