A law enforcement source in Palm Beach County , where Limbaugh owns a $ 24 million oceanfront mansion , said last week that Limbaugh 's drug use is still under investigation .
Meanwhile , law enforcement officials in Palm Beach County , Fla . , where Limbaugh owns a $ 24 million mansion , said his drug use is under investigation .
Prosecutor Jim Hardin called the decision a victory for Kathleen Peterson's family.