[ARCHIVE ANSWER]
It sounds like your zig-zagging was smart and you did not panic.I'd say make sure your dealer hasn’t gotten raided and warn
him that you saw the kop. There is no way to tell why the kop was there. Watch the neighborhood to note the cars parked around the neighborhood before you make any more pickups. If you don’t feel comfortable and have another dealer, go to the other dealer for awhile, and if you want to switch back after a month or so, it’s safer.Also you might talk to your dealer, go by his place, but leave empty handed to see if you get stopped. If your dealer only sells weed and keeps his operation small and personal, you have less to worry about.In any event, if you see a kop again before you leave, you don't have leave. Sooner or later, the officer will leave. It called “lunch,” and they tend to not miss it.