Case 164
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.
Hayden
“Either Logan or Blake is guilty.”
Logan
“Either Noah or Blake is guilty.”
Noah
“Lane is innocent.”
Blake
“Lane is guilty.”
Lane
“Noah is innocent.”
Who is guilty?
Solution: Blake
If Blake is guilty, Blake's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.