Effective June 1, 2023, the U.S. Department of Transportation (DOT) allows regulated employers to use oral fluid testing as part of their drug testing programs. The change is pursuant to a final rule that was published on May 2, 2023. However, practically speaking, oral fluid testing cannot yet be implemented because, as of June 1, 2023, the Department of Health and Human Services (DHHS) had not yet certified any laboratories to perform the testing – and two must be certified for any testing to be performed.