A way of catching snakes to study?

[msubigdawg]

I was watching Animal Planet and on Animal Cops Miami they had a guy I think from the Everglades Outpost on there. He had to catch some cobras that had gotten loose. Now he used a method to catch one that I was wondering what other people thought about using to help catch snakes to study. He drove a rod into the ground then tied a string to it and to the other end of the string he tied bait, in this case a dead baby ball python. Then he covered the bait with a box with a little opening so the snake can get in. The snake found the bait and swallowed it and was stuck there because of the string. So the next day he came and found the snake. Now they didn't show how he removed the string. I dont know if he pulled it out or let it swallow it. I figured either way you would have to use a natural fiber string. I also figure you wouldn't catch things like rattlesnakes since they hunt with heat and the prey would be dead and not warm. But I was wondering what people thought about this as a way of catching like rat snakes or corn snakes and other snakes like that.