1. Never screw [over] your partner.
2. Never let suspects stay together.
3. Always wear gloves at a crime scene.
4. Don't believe what you're told, always double check.
The best way to keep a secret is to keep it to yourself.The second best? Tell one other person- if you must. There is no third best.
6. Never say you're sorry.
7. Always be specific when you lie.
8. Never take anything for granted.
9. Never go anywhere without a knife.
11. When the case is finished, let it go.
12. Never date a co-worker.
15. Always work as a team.
16. It's better to seek forgiveness than ask permission.
17. Never be unreachable.
18. Never involve lawyers, things will turn nasty.
22. Never interrupt during an investigation.
23. Never mess with a Marine's coffee if you want to live.
26. Never apologize -- it's a sign of weakness.
38. Your case, your lead.
isn’t number six actually as follows: 6. Never say you’re sorry - its a sign of weakness. I thought the exact same thing when I heard Joe apologized.
Truly sad that people feel the need to apologize because they uttered the truth (regardless of the venue).