FLT INSTRUCTOR WITH SPI IN TFC PATTERN ACCUSED OF CLOSE PROX BY FAA EXAMINER IN TWIN.

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I WAS RETURNING TO MY HOME BASE ARPT; MO49; WITH A STUDENT. I RPTED ON 122.8 'WASHINGTON TFC SMA X 3 MI SW INBOUND FOR LNDG ON 34. AS WE WERE NEARING THE ARPT ON THE SW SIDE OF THE RIVER; WE OBSERVED A NO RADIO TAILDRAGGER DEPARTING 34. I INFORMED MY STUDENT THAT I WANTED HIM TO FOLLOW THE TAILDRAGGER. WE THEN CONTINUED NBOUND SO THAT WE COULD GET IN BEHIND THE TAILDRAGGER. AS WE WERE CONTINUING NBOUND TO POS OURSELVES BEHIND THE TAILDRAGGER; WE NOTICED A TWIN ENG ACFT SBOUND AT OUR 1 O'CLOCK. I INITIATED A TURN TO THE L; BUT QUICKLY SAW THAT THE TWIN WAS NO FACTOR SO I LEVELED OUT. FROM OUR POS; THE TWIN WAS ON THE OTHER SIDE OF THE RIVER AND IT APPEARED TO ME TO BE IN THE L-HAND TFC PATTERN AT MO49. WE ENTERED AN EXTENDED L DOWNWIND FOR 34. I RPTED ENTERING DOWNWIND FOR 34 AND THAT WE WERE NUMBER 3 FOR LNDG BEHIND THE TAILDRAGGER (1) AND THE TWIN (2). WE LANDED AS PLANNED. AS I WAS FILLING OUT MY STUDENT'S LOGBOOK; I WAS ASKED BY AN FAA INSPECTOR FOR MY PLT'S CERTIFICATE. THE INSPECTOR TOLD ME THAT WE HAD PASSED OFF OF HIS R WING BY 300 FT. HE THEN INFORMED ME THAT HE WOULD CONTACT ME IN THE FUTURE REGARDING THIS EVENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES FAA SENT A LETTER REQUESTING HIM TO COME TO THE OFFICE AND TELL WHAT HAPPENED. AFTER HIS EXPLANATION; THEY SAID NOTHING FURTHER WOULD DEVELOP. IT SEEMS RPTRS BOSS SUED THIS PARTICULAR EXAMINER AND THERE IS ONGOING ANIMOSITY TOWARD HIS OP.