So everyone had to notice the signals the bioweapons scientist give the guy with the cap in every scene he was in (even crossed right in front of Elizabeth and Phil when they finally approached)? Not FBI so who could it be?

Lil Dicky qualifies: https://soundcloud.com/lil-…

Willing to bet that the pregnancy tests are to detect the presence of clozapine (anti-psychotic), making it perfect sense to have a bunch of them.