If a police officer pulls you over due to suspecting you are driving while intoxicated, he or she may ask you to step out of the car and perform a field sobriety test. The point of this test is to determine if you are drunk and deserving of an arrest for DWI.
While it is always a good idea to cooperate with law enforcement, you do not have to take this roadside test in Texas. You can politely refuse to take it and will not be subject to any penalties for refusal. This fact is important to know because field sobriety tests are easily inaccurate and only harm your case.