Photo: Roadside DUI Marijuana Test Simulation – AP

Simulating a roadside investigation of a potentially intoxicated driver, Robin Rocke, left, the Drug Evaluation Classification Coordinator for the Colorado Dept. of Transportation, evaluates the assessment skills of a state trooper using a flashlight and so-called pupilometer as he undergoes a several week long Drug Recognition Expert class, at the Colorado State Patrol Training Academy, in Golden, Colo., Thursday March 6, 2014.