I can pretty much assure you they're not marking Mexican cartel grows. They try not to advertise locations. Probably not domestic, either, and probably not anything at all related to a marijuana grow. Most likely something from forest service, or state or county. For paranoia, if you stumble onto a cartel grow, which we have from time to time up here, they will have you scoped in before you're ever aware of it, if the guards are doing their job. Luckily, the paisanos the cartel puts in charge don't really have their hearts in it. So they will pretty much just run like h*ll, especially if they think it's LEO's.