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 say you're sorry. It's a sign of weakness.
Rule 7: Always be specific when you lie.
Rule 8: Never take anything for granted.
Rule 9: Never go anywhere 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 lawyers.
Rule 14: Bend the line, don't break it.
Rule 15: Always work as a team.
Rule 16: If someone thinks they have the upper hand, break it.
Rule 18: It's better to seek forgiveness than ask permission.
Rule 20: Always look under.
Rule 22: Never ever bother Gibbs in interrogation.
Rule 23: Never mess with a Marine's coffee... if you want to live.
Rule 27: There are two ways to follow someone. First way, they never notice you. Second way, they only notice you.
Rule 28: When you need help, ask.
Rule 35: Always watch the watchers.
Rule 36: If you feel like you are being played, you probably are
Rule 38: Your case, your lead.
Rule 39: There is no such thing as coincidence.
Rule 40: If it seems like someone is out to get you, they are.
Rule 42: Never accept an apology from someone who just sucker punched you.
Rule 44: First things first, hide the women and children.
Rule 45: Clean up the mess that you make.
Rule 51: Sometimes you're wrong.
Rule 69: Never trust a woman who doesn't trust her man.