It's hard to say for sure man but I wouldn't worry too much. Mostly they're lookin' for the growa like those big ones you saw a couple pages back. There are plenty of those big ass grows for them to mess with instead of wasting their time on your little legal medical grow. I had a small plane come up off course and make a couple circles around my place the other day. I think it was just sight seers out lookin' around but it could for sure be LEO. They do use planes as much if not more than choppers, they are cheaper to operate by far.
Think about how many big grows they bust every year....how may they miss....how many legal medical grows tere are now....it's really a numbers game that we are on the better side of but that doesn't guaratee anything....good luck bro!