^sounds like a cop....The "pot copters" as you put it, catch people because they bunch too many marijuana plants together. Use that brain of yours buddy, it has nothing to do with the color of the plant, how long its green, or anything like that. Its about how much is there in that spot for them to spot, and of course how big the plants are. Choose a good location, and you are growing auto's, so i would be more worried about somebody stumbling on to them around your spot, than some helicopters. I think it would be kind of hard to spot a few autos from a bird thats thats flying high enough to stay out of powerlines/treelines. Just my 2cents. Stay safe and happy growing. Oh and maybe read a few threads on outdoor growing and how not to get caught. Theres plenty of those on this site with loads of good info.