Treasury ethics attorneys have given Yellen flexibility to work on any related markets or broad financial services sector issues, with no limits on current or future matters, the Treasury official said. She may need to seek further authorization to deal with specific firms she listed.

In the memo granting Yellen permission to call the meeting of regulators, a Treasury ethics official, Brian Sonfield, said it would be "difficult, if not impossible" for Yellen to recuse herself from matters involving market volatility.

"You are the Secretary of the Treasury, the duties of which require you to be involved in a broad array of matters focused on these sectors," Sonfield wrote.

"Issues relating to these sectors could arise at any time without the opportunity for consultation with the ethics office," and "argue in favor of prior authorization."

source: https://www.streetinsider.com/Reuters/Exclusive%3A+Treasurys...

Do you see the problem? She is so trusted as an expert that people have given her authorisation to involve herself in matters related to firms she just took money from, regardless of the obvious incentives and conflicts of interest. Maybe you don't think those incentives or conflicts are a big deal, in which case I've got a bridge to sell you.