Always be specific when you lie. (Season 1, Episode 23)

Rule #7

• Permalink: Always be specific when you lie.
• Rating: Unrated

Never apologize. (Season 7, Episode 12, but referenced previous times without a number attached)

Rule #6

• Permalink: Never apologize.
• Rating: Unrated

Your case, your lead. (Season 6, Episode 16; Season 10, Episode 3)

Rule #38

• Permalink: Your case, your lead.
• Rating: Unrated

You don't waste good. (Season 8, Episode 22)

Rule #5

• Permalink: You don't waste good.
• Rating: Unrated

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. (Season 4, Episode 11)

Rule #4

• Permalink: The best way to keep a secret? Keep it to yourself. Second best? Tell one other person, if...
• Rating: Unrated

Never be unreachable. (Season 3, Episode 13, Gibbs)

Rule #3

• Permalink: Never be unreachable.
• Rating: Unrated

Never accept an apology from someone who just sucker punched you. (Season 9, Episode 16)

Rule #42

• Permalink: Never accept an apology from someone who just sucker punched you.
• Rating: Unrated

Don't believe what you're told. Double check. (Season 1, Episode 1, Mike Franks)

Rule #3

• Permalink: Don't believe what you're told. Double check.
• Rating: Unrated

Always wear gloves at a crime scene. (Season 1, Episode 1, Mike Franks)

Rule #2

• Permalink: Always wear gloves at a crime scene.
• Rating: Unrated

Never screw over your partner. (Season 4, Episode 14, Gibbs)

Rule #1

• Permalink: Never screw over your partner.
• Rating: Unrated

Sometimes you're wrong. (Season 7, Episode 24, titled "Rule Fifty-One")

Rule #51

• Permalink: Sometimes you're wrong.
• Rating: Unrated

Never let suspects stay together. (Season 1 Episode 1, Mike Franks)

Rule #1

• Permalink: Never let suspects stay together.
• Rating: Unrated