I think the issue with audit companies has primarily been dealt with by the profession itself, in that it is self-regulating, with its own rules around when you can act as an auditor, and that if you are going to act as the auditor for a company, you should not then be participating in consultant service contracts with that same company or organization that you are auditing. But that, as I understand it, is done primarily through the profession's own self-regulation, as opposed to anything the government is doing.
On June 14th, 2006. See this statement in context.