Fairfax County Public Schools changed the bus stop location for students in Mount Vernon after a parent raised concerns over its proximity to a registered sex offender. The bus stop in question sits at the corner of Cedar Road and Black Alder Drive. FCPS announced that starting on Tuesday, the new pick-up and drop-off spot will be at the corner of Black Alder Drive and Teak Court, about a block away and out of view from the home. A father, who wanted to remain anonymous, said he recently…