Instead of "smoothing things out," the cop laid himself out. Worse still, there was not only a good chance that he'd get fired, but be prosecuted, as well.
It's by no means the first time I've heard of someone taking a short cut, and I know it won't be the last. On the one hand, I understand the temptation: You know the suspect is good for the crime, and rather than document him going from Point A to Point B to Point C and so on, you just skip ahead to Point Z. The problem is that when you're dealing with probable cause declarations and similar paperwork, you leave yourself vulnerable to all manner of impeachments, not only regarding the arrest in question, but as it relates to your credibility in all past and future arrests.
One of the biggest problem areas for cops involves their attempts to work around the exclusionary rule.
Now, as a concept, it's arguably understandable: You want to prevent cops from conducting illegal searches and seizures. But as a practice it smacks of redundancy: If the person is culpable for the offense, then so be it: He's guilty. And if he isn't, then anyone who's inclined to make a false or illegal arrest will probably cover his ass by falsifying its documentation, as well.
But most of the time, it's not the malicious cops who find themselves behind the eight ball. It's the numbnuts who screw themselves up by trying to make a half-assed concession between their natural laziness and adhering to the law.