interesting question. I don't know. FDA regulators could be forbidden from buying stock due to rules about conflicts of interest. If they were forbidden, could they tell their friends? I think it is more likely that such interest is coming from outside the regulatory community - perhaps people familiar with ongoing research about which we are not yet privy.
My breakfast friend is still waiting for that cup of coffee I promised him when the stock hits a dollar. He is starting to feel thirsty.