I keep a trail camera right near the tree I hunt, I go down to it once a week and swap out the sd card. About 90 pictures on it each time right now. I only dump about 2 gallons of scattered corn infront of it, so it takes pictures. Last year I did this so routinely that they got a little used to it I believe... When I hunt ( I only bow hunt) I drop some corn about 20 yrds out from my tree to make them stop and give me time to get a perfect shot. I dont believe I bothered anything. However my walk in/out is short maybe 110 yards in and out. I dont touch anything. And some times spray my shoes with cover scent. A little corn to help your shot wont hurt anything. Same as if you find a $5 in the street... like your not going to stop and pick it up.