WEST PALM BEACH, Fla. - Rush Limbaugh was wrong when he accused prosecutors of singling him out, but not by much. Palm Beach County prosecutors investigating the right-wing radio host for his prescription drug abuse have filed "doctor shopping" charges against one other person in the past five years, according to records. Limbaugh's lawyer said the court documents, reviewed by The Palm Beach Post yesterday, prove his client was unfairly targeted. "Rush Limbaugh has been singled out for special prosecution because of who he is," Roy Black told the paper. "We believe the state attorney's office is applying a double...