A PA28 PLT VIOLATED THE DC ADIZ WHEN LNDG MTN.

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I TOOK A PERSONAL FLT FROM PTW TO MTN. I DEPARTED PTW AND CLBED TO 3000 FT; THEN CALLED PHL FOR FLT FOLLOWING. I WAS TOLD BY PHL TO REMAIN CLR AND CALL BACK IN 20 MINS. I PROCEEDED DIRECT TO FALSTON; MD; SO I WOULD REMAIN CLR OF ABERDEEN. I LISTENED TO MTN ATIS. I MADE MY ORIGINAL CALL TO MTN TWR OVER W42 AT 3000 FT; SAYING I WAS OVER FALSTON ARPT AT 3000 FT WITH ATIS; INBOUND. THEIR REPLY WAS; 'RPT R DOWNWIND MIDFIELD RWY 33.' AT THIS POINT; I THOUGHT I WAS CLRED INTO THEIR AIRSPACE. MY SECOND CALL WAS TO MARTIN TWR TO RPT MIDFIELD; R DOWNWIND. ONCE ESTABLISHED; MTN ASKED WHAT CODE I WAS SQUAWKING. I REPLIED 1200. THEY ASKED IF I HAD A DISCRETE CODE. I REPLIED; 'NO.' I WAS THEN INSTRUCTED TO CALL POTOMAC WHEN I WAS ON THE GND; WHICH I DID. I GAVE POTOMAC ALL MY INFO WITH MY EXPLANATION OF WHAT HAPPENED. I FEEL IF PHL HAD TAKEN THE FLT FOLLOWING; THIS WOULD NOT HAVE HAPPENED. I FEEL MTN ATIS SHOULD HAVE ADVISED OF ADIZ. I WAS TOLD I WAS THE THIRD PLANE IN 2 DAYS THAT DID THAT. I SHOULD HAVE CHKED NOTAMS AND FOR TFR; I NEGLECTED TO. IT WILL NOT HAPPEN AGAIN. I WILL NOT TAKE A FLT; EVEN LCL; WITHOUT A CALL TO FSS FIRST. I AM AN ACTIVE INSTRUCTOR AND I CAN TELL YOU THIS WILL BE TAUGHT TO ALL MY STUDENTS AS A LEARNING EXPERIENCE.