<P> The Parental Advisory label (abbreviated PAL) is a warning label first introduced by the Recording Industry Association of America (RIAA) in 1985 and later adopted by the British Phonographic Industry (BPI) in 2011 . It is placed on audio recordings in recognition of excessive profanities or inappropriate references, with the intention of alerting parents of potentially unsuitable material for younger children . The label was first affixed on physical 33 1 / 3 rpm records, compact discs and cassette tapes, and it has been included on digital listings offered by online music stores to accommodate the growing popularity of the latter platform . </P> <P> Recordings with the Parental Advisory label are often released alongside censored versions that reduce or eliminate the questionable material . Several retailers will distribute all varieties of the product, occasionally with an increased price for censored versions, while some sellers offer the amended pressings as their main options and choose not to distribute the explicit counterparts . However, the label has been questioned for its perceived ineffectiveness in limiting the amount of inappropriate material that young audiences are exposed to . </P>

When did they start putting parental advisory stickers on cds