They offer the 12-hour DWIE class. They do not drug test you.
Here is a link
Search for DWIE classes in Texas
Written by Charlie Roadman and available on Amazon. It explains how to work with your attorney, what the prosecutor and judge cares about, and what you should be doing while your case is pending.
The Insider's Guide is a comic book written by Charlie Roadman about Austin DWI charges. read it here.
This is a 4-part podcast interview about Austin DWI charges. Charlie explains the Austin criminal justice system and what you can do to get the best result.