There is no secret to what ANY of the officers of CVM are doing as far as stock purchases. Every share/warrant purchased is reported for everyone to see...
I'm sure you are also aware that officers of ALL companies frequently invest in their own stock. I would think it would be common sense to assume they would all know more about the goings on than Joe Public.
It's not illegal insider trading if you file every purchase with the SEC for everyone to see and also act on.
I think the real risk for insiders is not buying, since that has to be reported, but it's the selling. If they sell on insider info (which is only apparent in hindsight after something materially bad happens) then they can get investigated to see if they knew about it before they sold.