From a March 1 post by Politico's Ben Smith:
Kings County, New York District Attorney Joe Hynes put out a statement just now:
On September 15, 2009, my office began an investigation into possible criminality on the part of three ACORN employees. The three had been secretly videotaped by two people posing as a pimp and prostitute, who came to ACORN'S Brooklyn office, seeking advice about how to purchase a house with money generated by their 'business.' The 'couple' later made the recording public. That investigation is now concluded and no criminality has been found.