Rule #1: "Never let suspects stay together."
Rule #2: "Always wear gloves at a crime scene."
Rule #3: "Don't believe what you're told. Double check."
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 #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."