I kill them, if they are on the property around the house. My wife was bit by a ground rattler, about six years ago, while walking on the driveway right at dusk. My Dad was bit by a cottonmouth while walking down to the water to go fishing. That's been a pretty good bit back. I dropped a short, fat cottonmouth on my flip-flop covered foot, summer before last, while moving firewood. I did not get bit, but when he coiled I was stuck between him and a boat trailer. I shot him with the snubby in my pocket, I was thankful I had it. In the woods, I'll let them go most the time.