Tampering is defined by the Clean Air Act of 1970 to be the removal or rendering inoperative of any emissions control device or element of design installed on or in a motor vehicle or its engine in compliance with federal regulations prior to its sale and delivery to the ultimate purchaser, or for any person to knowingly to remove or render inoperative any emissions control device or element of design after such sale and delivery to the ultimate purchaser (Clean Air Act Sec. 203(a)(3)(A)).

For the purposes of the Canyon County and City of Kuna I/M vehicle emissions testing program, vehicles that are found without emissions control devices will fail the emissions test until the vehicle is brought back into compliance with manufacturer emissions control device specifications. Consumers should be aware that if the emissions control device is not working properly and is still intact on the vehicles and the vehicle is under 8 year old and under 80,000 miles, they may qualify for a manufacturer warranty for emissions control devices.

Waivers and extensions will not be granted for vehicles with tampering-related emissions test failures in accordance with Federal Guidelines (40 CFR 51.360(a)(3)).