Case 081
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.
Taylor
“Morgan is guilty.”
Morgan
“Neither Alex nor Casey is guilty.”
Frankie
“Morgan is innocent.”
Alex
“Neither Morgan nor Casey is guilty.”
Casey
“Either Taylor or Morgan is guilty.”
Who is guilty?
Solution: Taylor
If Taylor is guilty, Taylor's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.