Gibbs Rule #1-51

Rule #1: Never let suspects stay together.[7]
Rule #1: Never screw over your partner.[8]
Rule #2: Always wear gloves at a crime scene.[7]
Rule #3: Don't believe what you're told. Double check.[7]
Rule #3: Never be unreachable.
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.[8]
Rule #5: You don't waste good. [10]
Rule #6: Never apologize. It's a sign of weakness.[11]
Rule #7: Always be specific when you lie.[12]
Rule #8: Never take anything for granted.[13]
Rule #9: Never go anywhere without a knife.[14]
Rule #10: Never get personally involved in a case.[15]
Rule #11: When the job is done, walk away.[16]
Rule #12: Never date a co-worker.[17]
Rule #13: Never, ever involve a lawyer.[6][2]
Rule #15: Always work as a team.[18]
Rule #16: If someone thinks they have the upper hand, break it. [19]
Rule #18: It's better to seek forgiveness than ask permission.[5]
Rule #22: Never, ever bother Gibbs in interrogation.[20]
Rule #23: Never mess with a Marine's coffee... if you want to live.[4]
Rule #27: There are two ways to follow someone. (1) First way, they never notice you. (2) Second way, they only notice you.[21][2]
Rule #35: Always watch the watchers. [10]
Rule #38: Your case, your lead.[22]
Rule #39: There is no such thing as coincidence.[15]
Rule #40: If it seems someone is out to get you, they are.[23]
Rule #44: First things first, hide the women and children.[24]
Rule #45: Clean up the mess that you make.[2]
Rule #51: Sometimes - you're wrong.[2]