According to a Notice published by the FAA today, the “minimum random drug and alcohol testing percentage rates for the period January 1, 2006, through December 31, 2006, will remain at 25 percent of covered aviation employees for random drug testing and 10 percent of covered aviation employees for random alcohol testing.” In 2004, the random drug test positive rate was 0.54%, less than the 1.00% threshold, and the the random alcohol test violation rate was 0.09%, less than the .50% threshold. As a result, both percentages will remain the same.
If you have questions about how the annual random testing percentage rates are determined 14 CFR 121, Appendix I, section V.C (for drug testing), and Appendix J, section III.C (for alcohol testing) or you can contact Dr. Mark Crispi, Office of Aerospace Medicine, Drug Abatement Division, Program Analysis Branch (AAM-810), Federal Aviation Administration, 800 Independence Avenue, SW., Washington, DC 20591; telephone (202) 267-8442.