49 CFR § 382.413 - Inquiries for alcohol and controlled substances information from previous employers.
(a) Employers must request alcohol and controlled substances information from previous employers in accordance with the requirements of § 40.25 of this title, except that the employer must request information from all DOT-regulated employers that employed the driver within the previous 3 years and the scope of the information requested must date back 3 years.
(b) As of January 6, 2023, employers must use the Drug and Alcohol Clearinghouse in accordance with § 382.701(a) to comply with the requirements of § 40.25 of this title with respect to FMCSA-regulated employers. Exception: When an employee who is subject to follow-up testing has not successfully completed all follow-up tests, employers must request the employee's follow-up testing plan directly from the previous employer in accordance with § 40.25(b)(5) of this title.
(c) If an applicant was subject to an alcohol and controlled substance testing program under the requirements of a DOT Agency other than FMCSA, the employer must request the alcohol and controlled substances information required under this section and § 40.25 of this title directly from those employers regulated by a DOT Agency other than FMCSA.