14 C.F.R. § 141.18

Carriage of narcotic drugs, marijuana, and depressant or stimulant drugs or substances

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If the holder of a certificate issued under this part permits any aircraft owned or leased by that holder to be engaged in any operation that the certificate holder knows to be in violation of § 91.19(a) of this chapter, that operation is a basis for suspending or revoking the certificate.