Not familiar with pharma but financial firms have pretty strict compliance departments and restrictions.
Yes - this is what I was thinking.
Physicians performing clinical trials (unlike some of those involved in designing them) are usually not employees of the pharmaceutical company, but I'd think it would still be good policy for the firms expressly to prohibit this kind of activity anyway ... for their own purposes and reputation-protection, quite apart from it obviously being good "public policy"? I ought to know, but don't, whether they actually do this routinely.