Rule No. 1 – Never let suspects stay together.

Rule No. 1 – Never screw (over) your partner.

Rule No. 2 – Always wear gloves at a crime scene.

Rule No. 3 – Don’t believe what you’re told. Double check.

Rule No. 3 – Never be unreachable.

Rule No. 4 – If you have a secret, the best thing is to keep it to yourself.
The second-best is to tell one other person is you must. There is no this best.

Rule No. 5 – You don’t waste good.

Rule No. 6 – Never say you’re sorry. It’s a sign of weakness.

Rule No. 7 – Always be specific when you lie.

Rule No. 8 – Never take anything for granted.

Rule No. 9  – Never go anywhere without a knife.

Rule No. 10 – Never get personally involved in a case.

Rule No. 11 – When the job is done, walk away.

Rule No. 12 – Never date a co-worker.

Rule No. 13 – Never, ever involve a lawyer.

Rule No. 14  – Bend the line, don’t break it.

Rule No. 15 – Always work as a team.

Rule No. 16 – If someone things that have the upper hand, break it.

Rule No. 18 – It’s better to seek forgiveness than ask permission.

Rule No. 20 – Always look under.

Rule No. 22 – Never, ever bother Gibbs in interrogation.

Rule No. 23 – Never mess with a Marine’s coffee… If you want to live.

Rule No. 27 – There are two ways to follow someone. First way, they never notice you.
Second way, they only notice you.

Rule No. 28 – If you need help, ask!

Rule No. 35 – Always watch the watchers.

Rule No. 36 – If you feel like you are being played, you probably are.

Rule No. 38 – Your case, your lead.

Rule No. 39 – There is no such thing as coincidence.

Rule No. 40 – If it seems someone is out to get you, they are.

Rule No. 42 – Never accept an apology from someone who just sucker-punched you.

Rule No. 44 – First things first, hide the women and children.

Rule No. 45 – Clean up the mess you leave behind; never leave behind loose ends.

Rule No. 51 – Sometimes, you’re wrong.

Rule No. 62 – Leave room for someone exiting the elevator.

Rule No. 69 – Never trust a woman who doesn’t trust her man.

Rule No. 70 – Keep digging till you hit bottom.