Oh, the irony. The investigator leading the probe into the 2012 scandal involving Secret Service agents paying for prostitutes in Colombia quit after being caught with a prostitute. David Nieland was busted in a prostitution investigation by Florida sheriff’s deputies, and was later identified by a woman who says he paid her for sex. He resigned from the Department of Homeland Security in August. Nieland denies the allegations, and there are two investigations underway.