Yes, they screen against one of the UK's lists of unauthorized individuals. At least, this was according to Howard Simon (dna20) when he mentioned it at the FBI/DIYbio workshop.
I was curious to see if anyone from DIYbio was on this list, so I did what any self-respecting hacker would do and wrote up some quick code to check... here's the details:
The good news is that nobody from the amateur communities seem to be on that list of excluded individuals for synthetic DNA.
disclaimer: I like to pretend I am working on an open-source microfluidic DNA synthesizer, which negates all their efforts and warps my perspective.