I found a low risk method for catching and disposing of snakes around my pond. Noticed a few about 3 feet long and wanted to find out, like you, if they were moc's or not. They weren't. I used a minnow trap - the one with 2 funnel entrances pointing inward. I put it right at water's edge, so the snake would have to go around it as it cruised the shallows. I placed a small frog inside and a day or so later I had one really mad snake inside. Inside the trap, it's safe to examine it. Mine was a water snake, so he lived. I would think that a Moc would fall for the same bait, but not sure. If so, you can drown it by sinking it for a while, or whatever method you like. Worked for me.
Dave
