>experience level), I don't know what I can ask this person to find out if he
> is the real McCoy or a pretender. My plan is to see if he can at least >produce

You don't need even to ask anything. Use Brainbench testing site.

The public beta of the BrainBench Visual FoxPro exam is now available
at:
http://www.brainbench.com/testcenter/brainbench/t1.jsp?core=/betapins.html
(choose Visual FoxPro from the list at the left).

If they score more than 4 points, take them on the board < g >