This is the same group that I posted another message about a few weeks ago. Last night they were out in their backyard from 2 a.m. until 4 a.m., a group of teenagers laughing and commenting and with the unmistakable coughing sound of pot smoke. This wouldn't bother me at 8 p.m., but it was 3 a.m. and I was trying to sleep. I turned on our rear floodlight which comes on slowly because it's a mercury vapor lamp. When it came on to full brightness, they went back into the house and I thought the problem was solved. But at 3 they came back out and continued with their soiree. No music, but a flashing light like a very slow strobe light. It was like a mini-rave. Their mother was either asleep or too busy with her boyfriend to care.
It's a little risky for me to confront them, or to call the cops on them, because the last time they did this, they saw me looking at them when they took a short intermission to conduct some kind of dance in the middle of the street. They all looked at me and they could see I wasn't very happy about this kind of activity in the middle of the night in this very quiet neighborhood (Kensington district of San Diego). Later that night I smelled smoke, but I just assumed it was their candles or barbecue. The next morning I discovered a chunk of wood that was half-burned, in the middle of my backyard. Obviously they had thrown it over the fence. A couple of days later I saw the teenage girl and she and her friends giggled when they saw me. They also had a bat mitzvah party for the youngest daughter a couple of months ago, and that involved a gaggle of screaming, giggling teenage girls which went until 1:30 a.m, apparently with the mother's full cooperation.
Talking to the mother about it doesn't seem like an option, since she herself is a bad neighbor. Her dog attacked the other neighbor's 15-year-old cat 2 years ago, and caused them to have an $1,800 vet bill, which she never paid and never even apologized. Even after that and warnings from the county animal control office, the dog still gets loose from time to time. So the mother is basically the same as the kids.
I thought of writing a letter to her and making it "from" an anonymous person who lives "on the other side of the canyon" complaining about the late-night parties, but I think she would suspect it was me who wrote the letter anyway. Is calling the cops the only option I have, if it happens again? I had thought of rigging a rattle with a long piece of fishing line, and pulling it quickly across their yard from a hole in the fence, scaring them into thinking there was a live rattlesnake there (which is a real possiblity since we live on the edge of a canyon). But that would probably work only once. Any suggestions?