Police tactics for discovering outdoor grows

Last year there was a big bust in my area. $140,000 worth of pot found about 3 or 4 miles from my house. I believe it was discovered by helicopter, but I'm not sure. I was just wondering what other tactics they have to discover people growing. I definitely won't be growing $140,000 worth, only 3-4 plants. They will be planted in heavy brush, where i would cut an opening in the top of the brush so the sunlight can hit them. Maybe I'm just paranoid because the large bust in my area, but does anyone think I am at a greater risk because they made a bust last year in my area? And furthermore, do you think they will spot 3-4 plants in the place I just described?

By the way, I live in Pennsylvania, so there is a lot of forest and brush and fields, so there's no chance of anyone on foot finding it.

There is always a risk.... Unless you live in a state that allows you to grow for medicinal purposes. So the answer is YES~!! Today I was in my barn and 2 helicopters flew by really low which pisses me off ( because they are not supposed to do that if you have livestock and I have horses ) They were doing a grid. Looking for weed. Luckily I harvested mine yesterday. :DAGAIN....YES IT IS A RISK~!!

:(...http://boards.cannabis.com/outdoor-g...es-advise.html