A number of years ago, I surveilled a drug peddler near school and called the SFPD when the bust was ready. It was hard for me to see from my position, which was an outside staircase about 25 feet from the parked car, exactly how many were in the car, either four or five. I do not know what else was found. All the targets were selling and buying.
There is a huge difference between possessing and selling marijuana. In the first instance, I always instructed students in residence housing to flush the flakes down the toilet, and on my order, any and all pipes were crushed in front of me by their owners. In the latter instance, when the amount was over one ounce, the police were called. These procedures were in place before October 2016.