Rule #1: Never let suspects stay together.
Rule #1: Never screw over your partner.
Rule #2: Always wear gloves at a crime scene.
Rule #3: Don’t believe what you’re told. Double check.
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.
Rule #5: You don’t waste good.
Rule #6: Never apologize. It’s a sign of weakness.
Rule #7: Always be specific when you lie.
Rule #8: Never take anything for granted.
Rule #8: Never assume.
Rule #9: Never leave home without a knife.
Rule #10: Never get personally involved in a case.
Rule #11: When the job is done, walk away.
Rule #12: Never date a co-worker.
Rule #13: Never, ever involve a lawyer.
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Rule #15: Always work as a team.
Rule #16: If someone thinks they have the upper hand, break it.
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Rule #18: It’s better to seek forgiveness than ask permission.
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Rule #22: Never, ever bother Gibbs in interrogation.
Rule #23: Never mess with a Marine’s coffee… if you want to live.
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Rule #27: There are two ways to follow someone. First way, they never notice you. Second way, they only notice you.
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Rule #35: Always watch the watchers.
Rule #36: If you feel like you are being played, you probably are.
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Rule #38: Your case, your lead.
Rule #39: There is no such thing as coincidence.
Rule #40: If it seems someone is out to get you, they are.
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Rule #42: Don’t ever accept an apology from someone who just sucker punched you.
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Rule #44: First things first, hide the women and children.
Rule #45: Clean up the mess that you make. (Also stated as, “Never leave behind loose ends.”)
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Rule #51: Sometimes – you’re wrong.
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Rule #69: Never trust a woman who doesn’t trust her man.
Updated: March 24th, 2012