As consumer-protection officials from the offices of dozens of state attorneys general met in Washington on Tuesday at a closed-door briefing on a Kentucky-led joint investigation of for profit colleges, the roster of former attorneys general working on behalf of the colleges grew to at least three. The Coalition for Educational Success, a group financed by several for-profit colleges, announced that it had hired a former Rhode Island attorney general, Patrick C . Lynch, to help advise it on drafting what it calls “Standards of Responsible Conduct” for higher education. Arizona’s former attorney general, Grant Woods, had previously been hired by the Apollo Group’s University of Phoenix, and Maine’s Andrew Ketterer is working for the Education Management Corporation, parent of the Art Institutes and other institutions. Attorneys general in at least six states are known to be investigating particular for-profit colleges’ recruiting practices.