That is something that I believe is not well addressed by the sec right now. If you have insider knowledge you cant say anything. There is a whole strategy that many people use where they manipulate the stock with a release. If they disclose their position, I believe they are in the clear. Short sellers do this all the time. Take a position and then release a report that bashes the stock.
I think the one he was being investigated for wiped 1billion off the value of his company.