I found the rules elsewhere, and I felt like sharing:
#1: Never let suspects stay together -episode Yankee White (season 1)
#1': Never screw over your partner. - episode Blowback (season 4)
#2: Always wear gloves at a crime scene. - episode Yankee White (season 1)
#3: Don't believe what you're told. Double check. - episode Yankee White (season 1)
#3': Never be unreachable. - episode Deception (season 3)
#4: If you have a secret, the best thing is to keep it to yourself. The second-best is to tell one other person if you must. There is no third-best. - episode Blowback (season 4)
#7: Always be specific when you lie. - episode Reveille (season 1)
#8: Never take anything for granted. - episode Probie (season 3)
#9: Never go anywhere without a knife. - episode One Shot, One Kill (season 1), Missing (season 1) and Probie (season 3)
#12: Never date a coworker. - episode Enigma (season 1)
#18: It's better to seek forgiveness than ask permission - episode Silver War (season 3)
#22: Never, ever bother Gibbs in interrogation. - episode Smoked (season 4)
#23: Never mess with a Marine's coffee if you want to live - episode Forced Entry (season 2)
