NS VIA Fan
Conductor
Not really.....US CBP Officers have limited powers under the Pre-Clearance Act while in Canada. Im still fully protected under the Canadian Charter of Rights and Freedoms and can terminate the preclearance process at any time and leave the area. Couldnt do that if I had already crossed the US Border (and it would probably ruin my chances of getting into the US for awhile!)Whether you go thru US inspection in the US, or pre-inspection at certain Canadian airports, should be no different....essentially once you clear the pre-inspection, you are virtually 'in' the US.....similar to being in a foreign embassy......
http://laws-lois.justice.gc.ca/eng/acts/P-19.3/FullText.html
10. (1) Every traveller has the right, at any stage of the preclearance process, to leave a preclearance area without departing for the United States, unless a preclearance officer informs the traveller that the officer suspects on reasonable grounds that the traveller has committed an offence under section 33 or 34.
And if an offence was committed.....it would be an RCMP officer (or other Canadian Police officer) brought in to investigate.