There are a bunch of scams operating using the 202 Area Code (Wash DC).  Some claim to be the IRS, others DEA agents, others saying you have been awarded a government grant and some that you have won a cruise to the Bahamas.  Unless you get a valid name on the caller ID don't answer.  If it is important they will leave a message. Also no government agency will initiate contact with private citizens by phone unless you have requested they call you.  It is all done by US Mail.  Google "202 Area Code Scams" for more details on what all is going on.