Much like when I hire staff - I don't necessarily care about a piece of paper saying they're qualified. The deciding factor will always be PROOF of knowledge.
If you're hiring for design, check out their portfolio as Collabora suggested. You can always find someone who is just starting out that maybe only has one project under their belt, but they're damn good at what they do - so just because someone has 40 designs rather than someone who has only 2, that does't mean that the guy with 2 doesn't know what he's doing. Maybe he's looking for an opportunity to expand his portfolio and if he can do the job, he/she might be the perfect fit!