Case 084
The Lost Access Card
A master access card was taken from the reception desk.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Lane
“Noah and Morgan are both innocent.”
Kendall
“Morgan is guilty.”
Finley
“Lane and Morgan are both innocent.”
Noah
“Kendall is guilty.”
Morgan
“Neither Finley nor Noah is guilty.”
Who is guilty?
Solution: Kendall
If Kendall is guilty, Kendall's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.