A defense attorney was cross-examining a police officer during a felony trial--it went like this: Officer, did you see my client fleeing the scene? 
No sir, but I subsequently observed a person matching the description of the offender running several blocks away. 
Officer, who provided this description? 
The officer who responded to the scene. A fellow officer provided the description of this so-called offender. 
Do you trust your fellow officers? 
Yes sir, with my life. 
WITH YOUR LIFE? Let me ask you this then officer--do you have a locker room in the police station--a room where you change your clothes in preparation for your daily duties? 
Yes sir, we do. 
And do you have a locker in that room? 
Yes sir, I do. 
And do you have a lock on your locker? 
Yes sir. 
Now why is it, officer, IF YOU TRUST YOUR FELLOW OFFICERS WITH YOUR LIFE, that you find it necessary to lock your locker in a room you share with those officers? 
You see sir, we share the building with a court complex, and sometimes defense attorneys have been known to walk through that room.