"Goddamn the Pusher Man, San Francisco" by Travis Jensen (via Caliber). He reports what went down:

Crack sting on Mission Street, San Francisco. This UFO (Undercover Five-O) was quite proud of the bust. I have to say, the suspect put up a pretty good fight as both men were a little bruised and battered in the end. This was all over what appears to be a $20 rock.

Update: Previously.