In this subtitle the following words have the meanings indicated. “Diesel vehicle” means a motor vehicle that: Is powered by a compression ignition engine; and Has a manufacturer’s gross vehicle weight rating or gross combination weight rating over 10,000 pounds. “Emissions inspector” means a person who is certified by the Department of State Police to perform an emissions test. “Emissions standard” means a measurement of acceptable diesel emissions. “Emissions test” means the sampling and measurement of certain components of diesel vehicle exhaust to determine if the diesel vehicle complies with an emissions standard. “Police officer” means any uniformed law enforcement officer.