The phrase "brief drug references" refers to a brief mention or allusion to drugs in a text, such as a book, movie, song lyrics, or other form of media. These mentions can be positive, negative, or neutral and may include descriptions of the effects of drugs, their use in cultural contexts, or simply an incidental reference to a drug without any further explanation. The term "brief" indicates that these references are not extensive or detailed, but rather brief and fleeting within the larger context of the work.