A DHC8 FLC ORDERS THE EVAC OF THE ACFT WHEN CREW FEELS THAT A DEPARTED PAX MAY HAVE LEFT SOMETHING ON THE FLT AT CLT; NC.

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WE TAXIED OFF THE GATE. SHORTLY AFTERWARD; FLT ATTENDANT CALLED AND SAID A PAX WANTED OFF. TAXIED BACK TO GATE. PAX SAID WANTED OFF AIRPLANE DUE TO A CRYING CHILD. CAPT TOLD HER SHE COULD SIT ANYWHERE ELSE (ONLY 9 PAX ON BOARD). THE WOMAN SAID NO; SHE JUST WANTED OFF. SHE GOT OFF AND HER BAGS WERE REMOVED. WE TAXIED BACK OFF THE GATE AND AS WE NEARED THE RWY THE CAPT AND I HAD OUR DOUBTS ABOUT THE WOMAN'S BEHAVIOR AND GREW CONCERNED ABOUT SOMETHING SHE MAY HAVE LEFT ON BOARD. TWR WAS NOTIFIED THAT WE NEEDED TO TAXI TO A SECURE AREA. SEVERAL EXCHANGES LATER WITH NO PROGRESS TOWARD A SECURE AREA; WE DECLARED AN EMER; SHUT DOWN AND EVACED THE PAX. NO DEVICES WERE FOUND AND SEVERAL HRS LATER WE CONTINUED THE FLT FROM CLT TO MGM. SUPPLEMENTAL INFO FROM ACN 484990: I TOLD FLT ATTENDANT TO SEND PAX UP TO TALK TO ME. I MAY OR MAY NOT HAVE VIOLATED STERILE COCKPIT BY DOING THIS -- I THOUGHT SINCE I WAS ON THE RAMP IT WAS OK TO INVITE PAX TO COCKPIT. WOMAN STILL WANTED OFF; SO I TOOK HER BACK TO THE GATE. TAXIED BACK OFF GATE. STARTED TO THINK THAT SHE MAY HAVE PLANTED A BOMB ON ACFT. DECLARED AN EMER AND EVACED PAX. CANINE UNIT SNIFFED DOWN ACFT. IF SIT WERE TO EVER OCCUR AGAIN; I WOULD TAXI BACK TO GATE AND THEN TALK TO PAX.