Case 040
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.
Kendall
“Either Marley or Dakota is guilty.”
Marley
“Neither Blake nor Cameron is guilty.”
Dakota
“Cameron is innocent.”
Blake
“Dakota and Cameron are both innocent.”
Cameron
“Dakota is innocent.”
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.