I found out this very same trap by accident. My father-in-law had a Great Blue Heron eating his koi fish, so he bought that black plastic bird netting and covered the pond with it. The first time we noticed it worked, there was a 6' Black Rat snake tangled in it. The father-in-law unsure of the snake was simply going to wait for the snake to die, but when I noticed ants were eating it alive I couldn't leave it. Hubby grabbed it's head, untangled it and we turned it loose into the woods. Snake repayed us later that summer by cleaning out our rat problem. It was spotted in our barn every now and then, haven't seen it this year.
Well, fall came and went and the father-in-law took the netting off his pond and cast if off to the side. Hubby and I were running a fence and I went to move this pile of bird mesh, and there were hundreds of snake vertibrae, probably 3-5 snakes had gotten caught in the discarded netting and died. It was neat seeing the skeletons, I hoped they strangled, I wouldn't wish death by ants on anything but ants, spiders, and wasps. LOL
I would definately try to eat those snakes! Never had snake before, but I'm sure there is plenty of snake-eating info all over the internet. Like anything I'm sure, as long as you cook it correctly it should be edible, not sure about palateable though. LOL
-Kim