Case 087
The Disabled Camera
A security camera was deliberately switched off.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Casey
“Blake is innocent.”
Blake
“Neither Finley nor Logan is guilty.”
Parker
“Either Blake or Finley is guilty.”
Finley
“Blake and Logan are both innocent.”
Logan
“Neither Casey nor Blake is guilty.”
Who is guilty?
Solution: Parker
If Parker is guilty, Parker's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.