Case 068
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.
Elliot
“Either Logan or Dakota is guilty.”
Logan
“Kendall is innocent.”
Marley
“Elliot and Logan are both innocent.”
Kendall
“Logan and Marley are both innocent.”
Dakota
“Either Elliot or Marley is guilty.”
Who is guilty?
Solution: Dakota
If Dakota is guilty, Dakota's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.