At the moment cops can just see a car they may "think" is loud drive past, then enter it into the database and a standard EPA letter gets mailed out. Or they can just say "too low" without justification and we have to sort it out. Too easy.
I wish defecting/EPA issuing a vehicle involved a lot more paperwork (eg., writing up a detailed report, photos of the defect and relevant measurements, references to paragraphs in VSI, etc, etc). The crimes that ACTUALLY IMPACT on people's safety eg., drunk/negligent driving and violent crimes should have more streamlined paperwork. That way you get police power where it's needed... what a thought. If only....