NEW : Screening procedures changed ; more marshals put aboard . NEW : Homeland Security chief says terrorist lists to be reviewed . Janet Reno claims air ##men are targeted randomly . Current , former marshals take exception to Reno 's claims .
NEW : Screening procedures enhanced ; more marshals put aboard . NEW : Homeland security chief says terrorist lists to be reviewed . Janet Napolitano says air marshals are assigned randomly . Current , former marshals take exception to Napolitano 's claims .