I HAVE RECEIVED ADVANCED TRAINING FOR SERIOUS DWI DEFENSE
When you seek the protection from a DWI / DUI arrest you need to ask about the credentials of your prospective lawyer. You need one who is dedicated to the complicated charge of DWI / DUI. I believe it is the only criminal charge in Texas which automatically comes loaded with technicalities.
First, when you are stopped and questioned by the officer, you will be asked to perform a Field Sobriety Test. You can read more about this test at a previous page, Field Sobriety Tests.
Second, when arrested you will be asked to submit to either a breath test or blood test. (Note: you can refuse this test.)