February 9, 2017 12:25 am Santa Ana Vice Unit Tackling Underground Prostitution Santa Ana’s vice unit is back on patrol targeting one of the community’s most pervasive problems — prostitution. Hetty Chang reports for the NBC4 News at 11 p.m. on Wednesday, Feb. 8, 2017. US & World Videos 2:38 Why USC wants foreign students to return to campus by Jan. 13 6:59 Is compounded weight loss drug for you? 2:30 Israel says it has launched retaliatory attacks in Iran 2:36 Murder gets 12 years in prison for burning woman in North Hollywood 2:38 These are the closest finishes of the Paris Olympics