Primary specimen.
Primary specimen. In drug testing, the urine specimen bottle that is opened and tested by a first laboratory to determine whether the employee has a drug or drug metabolite in his or her system; and for the purpose of validity testing. The primary specimen is distinguished from the split specimen, defined in this section.
Source
49 CFR § 40.3
Scoping language
In this part, the terms listed in this section have the following meanings: