Driving under the influence of drugs (DUIDs) occurs when an individual cannot operate a vehicle like a sober person due to drugs in their system and is prohibited under California Vehicle Code section 23152(e) and California Vehicle Code section 23152(f). Illicit drugs, prescription drugs, over-the-counter medication, or a combination of alcohol and drugs may all potentially lead to a DUID if the driver is impaired. Unlike driving under the influence of alcohol, there are no set limits for drug concentration levels in a person’s system. This is largely because of the inconsistency and variety of reactions among people.