Colorado Attorney General John Suthers has launched an investigation into whether Denver-based foreclosure law firm Aronowitz & Mecklenburg "misrepresents its posting costs" when billing homeowners for foreclosure expenses. The charges can reach $150, but the person who does the posting is paid only $7 plus mileage, according to a lawsuit filed in Denver District Court. The subpoena will aid "the investigation of possible deceptive conduct" under Colorado's consumer protection law, Suthers indicated. The litigation argues that Aronowitz & Mecklenburg's ownership of Xceleron, a company that posts notices advising homeowners of their foreclosure rights, allowed it to generate millions of dollars by charging a posting fee five to six times higher than the market rate. Investigators with the AG's office say the profits could surpass $5 million. Suthers hopes to force the law firm to comply with investigative subpoenas issued in April for detailed documents explaining the charges. There are about four other cases in which Suthers' office has recently sued a law firm or process-service company over information about their charges to homeowners.