Do  NOT  use sticky glue traps outside. 
Traps placed outside capture all sorts of non-target animals and can result in a slow agonizing death.

Glue traps used indoors need to be checked often. 
Animals left in these traps for an extended period of time will dehydrate, starve and experience a slow inhumane death.

Austin Reptile Service recommends
non-sticky Funnel Traps or other humane snake traps.
Non-sticky Funnel Traps are a humane tool for removing unwanted snakes from inside your home.

Here are some resources for purchasing Humane Snake Traps:

•   Tomahawk Live Traps 
use the ARS 10% discount code DCIHTFC

•   Humane Snake Trap (Amazon)
•   Cahaba Snake Trap (Amazon)