Gibbs' Rules

I really enjoy NCIS.

It is well-written, smart, and I enjoy the character development.

Leroy Jethro Gibbs is the senior field agen of a Naval Criminal Investigation Service (NCIS) team; well, from what I have seen, he is second to the Director of the entire NCIS organization. In many of the episodes, there is conversation about some of Gibbs' Rules, rules that are not written down but that his team is in the process of learning. In "Switch" (Episode 304) we find out that there are "about 50 Rules", but we don't find out exactly what all the rules are.

Thanks to Google, here are the rules thus far (please note that a couple, rule 1 and 3) are repeated, and the rules are different). This is either a mistake by the writers (which I doubt), or this may indicate that Gibbs internally changes the numbering of the rules, perhaps based on their relative importance to him.

Rule #1: Never let suspects stay together.
Episode 101 "Yankee White"

Rule #1: Never screw over your partner.
Episode 414 "Blowback"

Rule #2: Always wear gloves at a crime scene.
Episode 101 "Yankee White"

Rule #3: Don't believe what you're told. Double check.
Episode 101 "Yankee White"

Rule #3: Never be unreachable.
Episode 313 "Deception"

Rule #4: The best way to keep a secret? Keep it to yourself. Second best? Tell one other person - if you must. There is no third best.
Episode 414 "Blowback"

Rule #7: Always be specific when you lie.
Episode 123 "Reveille"

Rule #8: Never take anything for granted.
Episode 310 "Probie"

Rule #9: Never go anywhere without a knife.
Episode 113 "One Shot, One Kill" and Episode 120 "Missing"

Rule #12: Never date a coworker.
Episode 115 "Enigma"

Rule #18: It's better to seek forgiveness than ask permission.
Episode 304 "Silver War"

Rule #22: Never, ever bother Gibbs in interrogation.
Episode 410 "Smoked"

Rule #23: Never mess with a Marine's coffee if you want to live.
Episode 209 "Forced Entry"