DETROIT (AP) — For decades, leaders of the Roman Catholic Church were largely left to police their own. But as American bishops gather for a conference this week to confront the reignited sex-abuse crisis, they’re facing the most scrutiny ever from secular law enforcement. From Michigan to New Mexico, attorneys general are sifting through files on clergy sex abuse that were seized at dozens of archdioceses. The Catholic church’s defenders say it is being singled out by overzealous prosecutors.