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Detective riddle

A renowned scientist was found dead in her subterranean laboratory. The security logs showed she entered at 8 PM and never left. The cause of death was dehydration. Her assistant claimed he hadn't seen her since noon that day. Detective Dale examined the sealed lab, saw a fully functioning sink, a water cooler, and an unblemished glass on the desk. He immediately arrested the assistant for conspiracy. Why?

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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