A young copper and his partner were checking a burglar alarm at a school late one night and noticed an open window. They climbed in and began to do a room by room search. They were alerted by noise coming from the main office. They sneaked into the room and surprised a burglar prying open a desk drawer. The offender wisely surrendered.
The young officers were FNG's and didn't have much experience in processing a felony pinch. They called in two of the older guys who worked a crime car in plain clothes and asked for help with the arrest. They figured they would share the credit and gain some knowledge at the same time.
Well you can guess what happened. By the time the paperwork was done the young coppers weren't even on the scene except for transporting the offender. The young coppers realized they had let a good pinch get taken from them. There was no recourse, the sergeant shrugged and said "ya gotta learn to do your own work guys". Good street coppers are very competitive and hustle to get the good arrest but only assholes steal them from other policemen. It was a valuable lesson the young guys learned that day.
Another incident was even worse. A man intent on suicide was sitting on the roof ledge of a five story building. A friend was trying to talk him down. Two big city coppers and a fireman went up in a FD snorkel bucket at the rear of the building. Quietly, they approached the man and grabbed him from the ledge. The man began fighting and trying to go over the ledge. He was wrestled from the roof and onto the bucket. He fought all the way down. The man was admitted to the psych ward of the hospital and the coppers were recommended for a life saving award for their heroism.
A month or so later at the monthly awards ceremony, (lots of heroic stuff going on in the big city) the presenter called out three names for the award. The two officers and the fireman right? Guess again! The Beat officer that had written up the incident had included himself as part of the save. He posed with the officers as if he had earned the medal. It was embarrassing. His wife was smiling so proudly at him though that it was better to leave it be.
These incidents are good examples of why coppers should do their own work especially if you want it done right.