Some one threw some pot seeds in a friend of mines hopper when he was planting corn and the helicopters spotted it,  He was proved innocent but they kept a close eye on him after. One afternoon they were flying around his farm and he pulled an empty M1 Carbine out of his truck and pointed it at them and made motions like he was shooting, They crashed the helicopter and they couldnt charge him with anything in the end but it was touch and go for a while,  He sure loved to tell the story about how he wooped the National Guard with an empty gun. I told him he was lucky it was a rookie and not the 2 Vietnam vets  that would buzz by my house on the KY river about 2 feet off the water. They would fly those things under the Bluegrass Parkway bridge that crossed the KY river.