DOT tests are regulated by the Department of Transportation. All parties participating in DOT testing (employers/employees, collection facilities, testing facilities, and Agency designees) have protocols that they must follow in regards to collection, processing, analysis, interpretation, and the reporting of test results. Failure to follow the protocols mandated by the Agency can result in the nullification and voiding of the test. Labs and collection facilities that repeatedly violate the Agency mandates can lose their certification to conduct DOT testing. Since DOT testing is mainly a labs bread & butter, this would spell the end for the lab as a business.

Here is the link to the regulations outlined by the Agency. And in it, you'll discover that uric acid is not part of validity checks, nor there is a set criteria for uric acid, as they are with all the validity checks mandated by the Agency: U.S. Department of Transportation / Office of the Secretary of Transportation