49 CFR § 40.247 - What procedures does the BAT or STT follow after a screening test result?
(1) Sign and date Step 3 of the ATF; and
(3) If the confirmation test will be performed at a different site from the screening test, you must take the following additional steps:
(i) Advise the employee not to eat, drink, put anything (e.g., cigarette, chewing gum) into his or her mouth, or belch;
(iii) Explain that following your instructions concerning the waiting period is to the employee's benefit;
(iv) Explain that the confirmation test will be conducted at the end of the waiting period, even if the instructions have not been followed;
(v) Note on the “Remarks” line of the ATF that the waiting period instructions were provided;
(vii) Ensure that you or another BAT, STT, or employer representative observe the employee as he or she is transported to the confirmation testing site. You must direct the employee not to attempt to drive a motor vehicle to the confirmation testing site.
(c) If the screening test is invalid, you must, as the BAT or STT, tell the employee the test is cancelled and note the problem on the “Remarks” line of the ATF. If practicable, repeat the testing process (see § 40.271).