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FAA Flight Standards Service Regulatory Support Division Airman Testing Standards Branch 

# FAA-8083-25B, Pilot’s Handbook of Aeronautical Knowledge—Addendum A 

References: 2013–2017 Update to Drug Use Trends in Aviation Safety Research Report, NTSB/SS-20/01 (dated February 13, 2020); National Transportation Safety Board (NTSB) Recommendation A-20-12, Section 4.2 

The details of this safety research report and the resulting safety recommendations can be accessed at www.ntsb.gov. 

The following will be included in the “Drugs” section of Chapter 17, Aeromedical Factors (page 17-16) in the next revision of FAA-8083-25: 

There is evidence taking illicit drugs significantly elevates the risk of having an aviation accident. Even though the Drug Enforcement Administration (DEA) defines marijuana as a Schedule I drug on its controlled substances list, states have taken steps to allow the possession, sale, and use of marijuana within their borders. The FAA has stated, “Marijuana is an illicit drug per federal law and its use by airmen is prohibited.” 

Note : Until the revision of FAA-H-8083-25 is published, this addendum is considered part of the current addition of the handbook and should be used as a reference. 

