Haven't done any research on the hunters, but they probably are trained to recognize the nests and destroy the nest, as well as capturing and killing more mature snakes. The dumb a$$(s) who buy one and releases or let's it get away is the cause. Watch all hell break loose when one gets a hold of a person, and they don't have any fear. They have been reported in populated areas. Now to develop the market, and the demand!
Hawkdancer