premise: (3) The refusal by a traveller to answer any question asked by a preclearance officer does not in and of itself constitute reasonable grounds for the officer to suspect that a search of the traveller is necessary for the purposes of this Act or that an offence has been committed under section 33 or 34.".
hypothesis: Travellers reserve the right to remain silent.
reason: A traveller's refusal to answer a question doesn't entitle an officer to search them.