Yes. The simple fact that the truck driver had a prescription for the drug that caused the accident is not sufficient to allow the responsible parties to escape liability. Regulations for commercial truck drivers apply equally in the case of prescription drugs and even over-the-counter drugs that can cause impairment. In fact, regulations imposed by the Federal Motor Carrier Safety Administration prohibit commercial truck drivers from consuming any type of drug that might impair the senses within the four-hour window of time before operating the vehicle.