49 CFR 40.83
Maintenance and disclosure of records concerning EBTs and BATs.
(a) Each employer or its agent shall maintain the following records for two years:
(1) Records of the inspection and maintenance of each EBT used in employee testing;
(2) Documentation of the employer's compliance with the QAP for each EBT it uses for alcohol testing under this part;
(3) Records of the training and proficiency testing of each BAT used in employee testing;
(4) The log books required by § 40.59(c).
(b) Each employer or its agent shall maintain for five years records pertaining to the calibration of each EBT used in alcohol testing under this part, including records of the results of external calibration checks.
(c) Records required to be maintained by this section shall be disclosed on the same basis as provided in § 40.81.