By RICARDO CASTILLO Questions galore arose in Mexico regarding the arrest on Tuesday, Dec. 10, of the country’s  former public security secretary from 2006 to 2012, Genaro García Luna, who served under President Felipe Calderón. Garcia Luna also was the Federal Investigations Agency (AFI) chief from 2001 to 2005, under President Vicente Fox. García Luna was arrested in Grapevine, Texas,