Leroy Jethro Gibbs has rules that he enforces with everyone on his team, in 3x05 "Switch" he told Ziva that there are approximately fifty rules. However, only a few rules have been revealed. Here are the rules that have been revealed so far:

Rule #1: Never let suspects stay together. (Franks) 1x01 'Yankee White'

Rule #1: Never screw over your partner. 4x14 'Blowback'

Rule #2: Always wear gloves at a crime scene.
(Franks) 1x01 'Yankee White'

Rule #3: Don't believe what you're told. Double check.
(Franks) 1x01 'Yankee White'

Rule #3: Never be unreachable. 3x13 'Deception'

Rule #4: The best way to keep...