...Craig said Brown should have been vetted more carefully, a job that he believes was the responsibility of the DEA. That was the agency that signed him on, said Craig, who acknowledged that it was the Detroit Police who paid Brown $150 for his assistance on a drug case.

"Had I known that Brown committed seven or eight violations, he would have not been considered," Craig said.

Craig said neither he nor the Detroit officer assigned to the DEA task force knew of Brown's background, which is publicly available on the government's so-called Pacer court system.

Craig said that before this case, he had not heard of Pacer, and acknowledged that Brown's background should have been easy to spot. Going forward, he said: "I guarantee, we will have access to Pacer."...