I am surprised they let the perp off, it seem that failure to arrest for 2 lbs possession would be a form of "dereliction of duty".. Cops should not be allowed to circumvent the law as written, at least not in such an egregious manner.
Here's an example of the usual, "good citizenship" displayed when potheads get together;
http://abclocal.go.com/kgo/story?section=news/local/san_francisco&id=9075543
When I grew up such discretion was the rule.
The death of that discretion is what is giving law enforcement a bad name.
I have spoken to police officers who said, they would often act differently but they have no choice if they want to keep their jobs.
I am glad those boys acted, and could act, with discretion and not hoop-jumping out of fear.