Apparently, none.
I'm a mechanical engineer who did PR work for the American Nuclear industry on Yucca Mountain. Why wouldn't a person like me be a better reporter on nuclear affairs than some numnuk journalist who has never looked at a differential equation, nuclear decay paths or materials data sheets?
My point is, many on Free Republic have specific expertise that just crushes the old media. So it isn't just "lawyers" who can think critically and expose the lies.