def process(self, pq):
        """
        :arg PlaceQuery pq: PlaceQuery instance
        :returns: modified PlaceQuery, or ``False`` if country is not acceptable.
        """
        # Map country, but don't let map overwrite
        if pq.country not in self.acceptable_countries and pq.country in self.country_map:
            pq.country = self.country_map[pq.country]
        if pq.country != '' and \
           self.acceptable_countries != [] and \
           pq.country not in self.acceptable_countries:
            return False
        return pq
:arg PlaceQuery pq: PlaceQuery instance
        :returns: modified PlaceQuery, or ``False`` if country is not acceptable.