Any person performing the position while under the influence of marijuana or any other illegal drug may constitute a threat to health or safety or in which a lapse of attention could result in injury, illness, or death, including without limitation a position that includes the operating, repairing, maintaining, or monitoring of heavy equipment, machinery, aircraft, motorized watercraft, or motor vehicles or handling of hazardous materials and/or waste as part of the job duties. Gains experience by working on the following items with minimal supervision: engine overhaul, fuel systems, electrical systems, transmissions, cooling systems, chassis, brakes, engine tune-up, and general maintenance.