The Office of Drug & Alcohol Policy & Compliance (ODAPC) lists the percents required for each DOT agency at www.dot.gov/ost/dapc/rates.html.
Steps to determine the minimum number of workers to test:
(1) Determine the random testing rates for drugs and alcohol applicable to the organization.
(2) Determine the number of workers engaged in safety-sensitive duties.
(3) Multiply this number by the percent required to determine the number to be tested.
(4) Divide the number to be tested throughout the year.
If a fraction is returned in the calculation for a time period, then options might include:
(1) ROUNDUP the number, resulting in more than the minimum number of workers being tested.
(2) adjust the number of people tested in each interval as needed to meet the annual target
Additional issues:
(1) Testing should be unpredictable.
(2) A person should not know in advance that he or she has been selected.
(3) If a person is engaged in safety-sensitive activities covered by more than 1 DOT agency, then follow the requirements of the agency for which the person spends more than 50% of time performing.
