Rule #1: Never let suspects stay together.
Ep 101 "Yankee White"

Rule #1: Never screw over your partner.
Ep 414 "Blowback"

Rule #2: Always wear gloves at a crime scene.
Ep 101 "Yankee White"

Rule #3: Don't believe what you're told. Double check.
Ep 101 "Yankee White"

Rule #3: Never be unreachable.
Ep 313 "Deception"

Rule #4: 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.
Ep 414 "Blowback"

Rule #7: Always be specific when you lie.
Ep 123 "Reveille"

Rule #8: Never take anything for granted.
Ep 310 "Probie"

Rule #9: Never go anywhere...