Interesting thought, but why would the physical have to be done in DC? The paperwork may have to be done here (not certain), but the physical is for the team and for MLB. The results could be sent to DC from anywhere. I believe MLB offices are in NY.
I emailed MLBTR to see if they could dig up anything. The guy does seem to be friends with a former scout. The only thing that makes me slightly believe it is that this is the only one of these types of tweets he has that I saw. Usually BSers are "breaking" many stories.