Clear Channel launched a `` self-policing '' effort after the Super Bowl XXXVIII halftime show in 2004 .
``  During the nationwide crackdown on indecent material following the Super Bowl XXXVIII halftime show in 2004 , Clear Channel launched a `` '' self-policing '' '' effort , and declared that there would be no `` '' indecent '' '' material allowed on the air . ''
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