(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.".
the refusal by a traveller to answer an officer constitutes reasonable grounds for them to search said traveller. 
( z1 constitute :ARG0 ( z2 refuse :ARG0 ( z3 person :ARG0-of ( z4 travel ) ) :ARG1 ( z5 answer :ARG0 z3 :ARG1 ( z6 officer ) ) ) :ARG1 ( z7 ground :ARG1-of ( z8 reasonable ) :purpose ( z9 search :ARG0 z6 :ARG1 z3 ) ) )