An elected San Francisco supervisor has been agitating up there for details on the cost of Mayor Gavin Newsom's security detail, without much luck. Supervisor Ross Mirkarimi, however, easily tracked down a number for the cost of assigning two LAPD officers fulltime to Los Angeles Mayor Antonio Villaraigosa during the day and one at night. About $450,000 a year, he was told, per the Chronicle's Matier and Ross.