Statute of limitations is the main stumbling block to prosecuting Cardinal Roger M. Mahony and aides in the sex abuse files from the 1980s released this week, experts say. Over the last decade, there have been numerous calls to prosecute Cardinal Roger M. Mahony and his top aides for their mishandling of clergy sex abuse. At least three grand juries, two district attorneys and a U.S. attorney have subpoenaed documents and summoned witnesses.