"Recommending" that someone kill a rattler could be illegal? Where exactly did you go to law school? I'd like to steer my son clear of it...

Just to ease your mind, and so you don't start calling district attorneys to try to have the guy in the picture prosecuted, the only reptiles on the endangered species list in Texas are a variety of sea turtles. No snakes. Perfectly legal to kill them anytime you want.