§40.103; §40.99; §40.333
Laboratories, employers and other parties required to retain specimens and records of tests should retain blind specimens and records of blind specimen tests in exactly the same way and for the same periods of time as they do actual employee specimens and test records.
For example, an employer would keep a record of a blind positive test for five years and a blind negative test for two years.
Laboratories would keep blind specimens for negatives in accordance with their SOPs and non-negatives for one year.