Actually had an issue with this several months ago...two FAA guys on the first two ATL-DFW FLIGHTS...third flight had delta dude reservation. I was standby for it until an FAA guys assumed it was "HIS". He did not identify himself to me nor did he have any ID on display. It devaluated into an ugly mess. CPO involved, Jumpseat committee notified, reports filed. Found out that they have been doing it ALOT. MY brother-in-law is big Whig with FAA in DC. He told me long time ago that unless they are on "official business" then they DO NOT have the right to bump you off the jump seat. Having worked for the FAA during furlough, I understand the mentality of quite a few of them... Band Camp with Authority. Some of them are GREAT....but unfortunately, many have a chip on their shoulder when it comes to pilots. As far as I'm concerned, which matters very little, they should be using their government credit cards and buying tickets. Nerd...I will have to give you the full scoop next time our paths cross...