I sent FOIA requests to the FBI, CIA, ATF, NSA, DSS, DIA, and the Secret Service asking for any documents they had about me. One sent me back a letter that I'd have to verify my citizenship before they could process my FOIA request, but specified that the requirement shouldn't be taken to assume they had anything about me. I never got around to sending them the documentation they asked for. The other agencies all said that they didn't have anything about me.