i grow in a shed a few grows back we had 21 plants in veg, 1pm this massive red copter flew over head and hovered right over the house! This thing was CLOSE! It had a RAF mod sign on the front! we were sure weed been nicked. we loaded up the plant in bin bags and bunged them in the car. we waited it out an hour or so away from the house for anything to happen. we decided to drive back in to town, there were police cars everywhere.. we were sure they were for us. we dropped off all the plants that were basically dead by now at a mates then went bk to the shed and filled it with chillie plants as not to look conspicuous but nothing ever came of it. i do think the chance of being court out by a copter are small unless your running a massive grow op. A small op will be fine, the heat coming off a 600 or even a 1000 could me misinterpreted as a boiler or anything. But paranoia does not help! When ever a copter flies over head im out there checking it out to be on the safe side.