DOT Rule 49 CFR Part 40 Section 40.277
Subpart N - Problems in Alcohol Testing
§ 40.277 Are alcohol tests other than saliva or breath permitted under these regulations?
No, other types of alcohol tests (e,g., blood and urine) are not authorized for testing done under this part. Only saliva or breath for screening tests and breath for confirmation tests using approved devices are permitted.
Last updated: Thursday, May 11, 2017