The article deals with some problems of the forensic linguistic examination in cases of drug propaganda, we analyze platform YouTube as an example. Problems with the traffic of narcotics link with the propaganda of narcotic, it has a certain influence on these figures, both among adults and among minors. The article highlights the problem of defining the concept of «propaganda», examines the discrepancy between the legislative formulation of the concept of «propaganda of narcotic drugs» and the concept of «propaganda» in the linguistic sense.