A BE35 PLT VIOLATED THE DC ADIZ.

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I OBTAINED A STANDARD WX BRIEFING FROM MILLEVILLE FSS PRIOR TO MY DEP FROM VAY. I PARTICULARLY ASKED THE BRIEFER ABOUT TFR'S AND ADIZ'S ALONG MY RTE OF FLT. I WAS INFORMED BY THE BRIEFER OF THE BALTIMORE CLASS B ADIZ; WHICH EXTENDS TO THE OUTER RING OF THE CLASS B; AND IS FROM SURFACE TO FL180. ALSO; THERE WAS AN EXPANDED 10 MI RESTR ZONE AROUND P40. I WROTE ALL THIS DOWN; BUT DID NOT FILE A FLT PLAN BECAUSE I DIDN'T KNOW IF I WOULD BE ABLE TO DEPART MY JOB TO MAKE THIS FLT. MY ORIGINAL IDENT USED DURING THE CALL TO FSS WAS IN ONE ACFT; HOWEVER; I ENDED UP FLYING TO FDK IN ANOTHER ACFT. I FLEW DIRECT RTES TO EACH WAYPOINT; WHICH WOULD HAVE KEPT ME CLR OF THE BALTIMORE CLASS B; AND THUS THE ADIZ. UPON LNDG AT FDK; I WAS INFORMED BY A CUSTOMS ENFORCEMENT OFFICER THAT I HAD VIOLATED THE BALTIMORE ADIZ. HE INFORMED ME THAT THE BALTIMORE ADIZ EXTENDS BEYOND THE BALTIMORE CLASS B AIRSPACE; AND BEYOND THE MODE C VEIL. I WAS NOT INFORMED BY THE BRIEFER THAT THE ADIZ EXTENDED BEYOND THE MODE C VEIL. THE POTOMAC APCH OPS MGR INFORMED ME VIA TELEPHONE; THAT I HAD VIOLATED THE BALTIMORE ADIZ; AND THAT I MIGHT OR MIGHT NOT BE HEARING FROM THE FSDO. I COOPERATED FULLY WITH THE CUSTOMS OFFICERS AND THE POTOMAC APCH OPS MGR. I APOLOGIZED TO BOTH FOR ANY INCONVENIENCE; BUT EXPLAINED HOW I WASN'T INFORMED BY FSS OF THE EXTENDED ADIZ AROUND THE BALTIMORE CLASS B.