NCIS

sympathize all of Gibbs ' rule inNCISand what they mean is essential to knowing Leroy Jethro Gibbs . Mark Harmon played the character reference for nearly two decades on the serial , using the rules to help establish his character and how the Naval Criminal Investigative Service control . Gibbs ' rules kick off the serial publication inNCISseason 1 , installment 1 , " Yankee White , " one of thebest episodes ofNCIS.The Special Agent - in - Charge uses them to give Sasha Alexander ’s fresh minted Caitlin " Kate " Todd the lay of the country when investigating aboard Air Force One .

Gibbs ' rules were necessaryfor theoriginal Major Case Response Team loss leader inNCIS . The rule were the quickest room for Gibbs to relay critical information in the shortest fourth dimension . While many of Gibbs ' linguistic rule dictate crime scene direction , afterward rule feel more personal . InNCISseason 3 , Gibbs said he had about 50 principle , but more of Gibbs ' rule were revealed untilMark Harmon exitedNCISin season 19 . The list expanded into about 100 rules , but it must be completed . Some of Gibbs ' linguistic rule still need to be discovered since Gibbs did n’t let out his code chronologically .

37Rule #1

Never Let Suspects Stay Together.

Gibbs let on Rule # 1,“Never let suspects quell together,“inNCISseason 1 , episode 1 , " Yankee White . " Gibbs stated the rule to Kate aboard Air Force One after she had kept a group of plane stave for questioning in the same room . Gibbs has an alternate Rule # 1,“Never screw over your partner,“which Jenny Shephard recited to him in season 4 , episode 14 , " Blowback . "

well out the entireNCIScollection on Paramount+ .

TheNCISfranchise acknowledged two Rule # 1s inNCISseason 8 , episode 11,“Ships in the Night . “When Josiah Willard Gibbs break Rule # 1,“Never get suspect bide together,“to get a confession , McGee clarified that there was more than one elementary rule . NCISexecutive manufacturer Shane Brennan revealed that it ’s because three of the regulations Gibbs has are from Mike Franks , and the rest are his own , which is why there are two Rule # 1s and Rule # 3s .

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36Rule #2

Always Wear Gloves At A Crime Scene.

Gibbs also revealed Rule # 2,“Always Wear Gloves At A Crime Scene,“to Caitlin Todd in " Yankee White " aboard Air Force One . After someone poison an aid to the chairwoman on his private aircraft , Kate became entangled in the NCIS investigating because she was with the Secret Service . While Gibbs initially tell Kate the rules so that she could cooperate in the investigation , the knowledge came in handy when Kate subsequently joined Gibbs ' squad after she was fired from the Secret Service .

35Rule #3

Don’t Believe What You’re Told. Double Check.

predominate # 3,“Don’t conceive what you ’re distinguish . doubly check,“is the final rule Gibbs imparts to Kate during the opening episode ofNCIS.The first three rules in " Yankee White " helped constitute the ethos of the entireNCISfranchise . Tony also revealed an alternative Rule # 3,“Never be unreachable,“to Ziva inNCISseason 3 , episode 13 , " conjuring trick . "

34Rule #4

The Best Way To Keep A Secret? Keep It To Yourself.

Jenny Shephard recited Rule # 4,“The effective Way To Keep A secluded ? Keep It To Yourself,“to Gibbs inNCISseason 4 , episode 11 , " Blowback . " The director also give two corollaries to the rule:“The secondly - dependable way to keep a secret , recount one person,“and"There is no third best . “The rule kick up a powerful delivery from Shephard , who had known Gibbs personally and had a more intimate understanding of his rules .

33Rule #5

You Don’t Waste Good.

Gibbs revealed Rule # 5,“Don’t waste good,“inNCISseason 8 , episode 22 , " Baltimore . " The sequence explored Tony DiNozzo ’s background as a Baltimore homicide detective and revealed how Gibbs and Tony began working together atNCIS.Gibbs ' harbinger to revealing Rule # 5 to DiNozzo was telling him,“You’re Good . “Tony was Gibbs ' 2nd - in - command untilMichael Weatherly leftNCISin time of year 3 .

32Rule #6

Never Say You’re Sorry.

Gibbs repeated Rule # 6 throughout the serial but give it an official number inNCISseason 7 , episode 12 , " Flesh and Blood . " Gibbs says"Never say you ’re sorry"to his protégé , Anthony DiNozzo , who was familiar with Gibbs ' rules . InNCISseason 3 , episode 23 , " Hiatus Part I , " Tony explain to Shephard that Gibbs took the theme song ruler from"The Duke Himself,“meaning John Wayne .

31Rule #7

Always Be Specific When You Lie.

Gibbs pronounce Rule # 7,“Always be specific when you lie,“inNCISseason 1 , episode 23 , " Reveille . " He recited the convention to Kate when she come up to meet him for java near the end of the series ' freshman season . The rule instructed Gibbs ' agents to be thorough when craft their covers .

30Rule #8

Never Take Anything For Granted.

Abby give away Rule # 8 inNCISseason 3 , episode 10 , " Probie . " After Abby severalize McGee that the 8th rule of the code would economise him , Ziva , Tony , and McGee tried to guess the rule . The moment signified that remember and maintaining Gibbs ' rules is just as important to the team as it is to Gibbs . An alternative Rule # 3 is reach inNCISseason 9 , sequence 21 , " Rekindled , " : " ​​​​​​​Never assume . "

29Rule #9

Never Go Anywhere Without A Knife.

Rule # 9,“Never go anywhere without a knife,“came up a few times throughoutthe 21 season ofNCIS . The formula was paramount for Gibbs since he had been a Gunnery Sergeant in the Marine Corps . Gibbs experience the value of self - defense first - hand and instilled in his team to have multiple ways to protect themselves .

28Rule #10

Never Get Personally Involved On A Case.

Tony established Gibbs ' dominion # 10,“Never get personally necessitate on a case,“inNCISseason 7 , episode 21 , " Obsession . " In the episode , Tony admitted to Gibbs that he broke the rule , again , to which Gibbs concord , saying,“That ’s the rule I ’ve always had the most problem with . “Moreover , inNCISseason 16 , episode 13 , " She , " Gibbs does away with the formula by physically burn it in his open fireplace .

Mark Harmon as Gibbs smiling crookedly while sitting down in NCIS

Mark Harmon as Gibbs and Sasha Alexander as Kate in NCIS

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Sasha Alexander as Todd, Michael Weatherly as Dinozzo, and Mark Harmon as Gibbs in NCIS

ncis lauren holly as jenny shepard standing next to mark harmon’s jethro gibbs

Mark Harmon as Leroy Gibbs and Michael Weatherly as Tony DiNozzo standing awkwardly together in NCIS

Mark Harmon as Gibbs, Abby, Ziva,  Bishop, and Vance in NCIS

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McGee standing behind Gibbs while they both wear jackets and caps at a marina in NCIS

Parker and McGee investigating in NCIS

NCIS