Case 136
The Disabled Camera
A security camera was deliberately switched off.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Kai
“Morgan is innocent.”
Morgan
“Marley is innocent.”
Marley
“Kai is innocent.”
Taylor
“Morgan and Marley are both innocent.”
Sam
“Either Morgan or Marley is guilty.”
Who is guilty?
Solution: Sam
If Sam is guilty, Sam's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.