Mumbai, May 27: The Narcotics Control Bureau (NCB) has given a ‘clean chit’ to Aryan Khan in the high-profile Mumbai cruise drugs case, according to sources. The son of Bollywood superstar Shah Rukh Khan was last year arrested by the drug agency along with several others after a cruise was raided off the coast of Mumbai and drugs were found. He was later granted bail. Meanwhile, former NCB chief B.V. Kumar alleged that the case was mishandled by Sameer Wankhede, who was NCB zonal director when cruise was raided and cops arrested Aryan.