NASCAR confirmed that it sent a memo to Monster Energy NASCAR Cup Series teams warning them not to use paint schemes to try and cheat the inspection process.

NASCAR must approve all paint schemes, and the memo told teams that any scheme officials feel is created to manipulate the OSS inspection station will be denied.

Additionally, if any scheme has already been approved and is deemed to have been modified, it is NASCAR’s discretion to have a developer spray applied (which will enhance the definition of the surface) before going through the inspection process.

In recent weeks team have been showing up to the racetrack with paint schemes that feature black trim along the wheel wells and corners of the fenders. The belief is light or dark colors on the scheme can reduce the scan density of the car in critical areas.