The Alco-Screen 02 Saliva Alcohol test is DOT approved for monitoring for alcohol consumption in a DOT Zero Tolerance testing program or where evidentiary test results are desired. The zero tolerance level for federally mandated DOT testing programs is .02% blood alcohol content (BAC). The Alco-Screen 02 uses this zero tolerance level (.02% BAC) as the detection level set point for the test strip resulting in the simplest method of test administration and interpretation.