When a Houston police officer or Texas Department of Public Safety trooper pulls a driver over on suspicion of driving under the influence, they rely heavily on a standardized toolkit. They look for slurred speech, bloodshot eyes, and unsteady balance. If they step you out of the vehicle, they will almost always conduct Standardized Field Sobriety Tests—a series of physical and cognitive exercises meant to measure impairment. The glaring flaw in this system is that roadside t