The hoax clue was just a random hoax I threw in.
So there's definitely one false clue. HOWEVER there may be more if the Killer has been sent to Isolation.
Clue 1 - Task 1 - Letter N
Clue 2 - Task 2 - chalk.
Clue 3 - Task 3 - random Isolation, no clue.
Clue 4 - Task 4 - Letter S. Might be a lie.
Clue 5 - Task 5 - Disc with M on it. (the surnames are not lies, these would have been revealed anyway
) The M might be though.