It makes absolutely no sense for there to be radio edits and blanket bans on explicit songs receiving air time. Music is the only form of communication that receives blanket bans by the FCC in this manner. TV shows and movies get different ratings, and as long as there is an appropriate warning label, it can show anything short of pornography. The moment a musician says any word worse than "damn," whether drug-related or a simple curse word, it's considered to be "explicit content" and they get censored and/or banned from the air. A radio station should be able to say, "we're going to play an explicit content song, so if you don't want to hear it, change the station." It's honestly ridiculous that such puritanical regulations are placed on a single industry.
/rant
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On TV they have explicit warnings for a block of time , granted it may be one show , but it is a block of at least 30 min. If a DJ wanted to commit a whole 4 hour segment to explicit music and limit his/her audience and therefore limit his/her advertisement possibilities I am sure they could. Doubtful too many Stations are willing to alienate broad segments of their listener base to appease the Artistic integrity of foul music.