<p>WEST PALM BEACH, Fla. (AP) ? Authorities are investigating whether Rush Limbaugh, already reeling from drug problems and his expulsion from ESPN, may have driven his vehicle just below the posted speed limits on numerous occasions, a law enforcement source who spoke on condition of anonymity said Wednesday.</p>
<p>As long as four years ago, local law enforcement manning Florida DUI checkpoints and 'speed traps' repeatedly clocked the ultraconservative demagogue at anywhere from one to six miles per hour below the applicable speed limits. Unconfirmed reports indicate that Limbaugh was also seen proceeding through intersections while traffic lights were yellow.</p>