You would do that? Now I'm beginning to consider if I should be asking candidates to bring some intellectual property owned by their current/previous employer as a filter.
There are, of course, ways, but some organisations make the overhead way too big to bother.
I personally know of a case where the 'core team' of a major payments processing system was running development being completely isolated from the internet due to security reasons. Need to check stackoverflow - sure - have a walk to the cabin where you have a dedicated machine connected to web for that. Oops, and no copy-paste, sorry.