A police official may without a search warrant search any person or container or premises for the purpose of seizing any article referred to in section 20 —
||if the person concerned consents to the search for and the seizure of the article in question, or if the person who may consent to the search of the container or premises consents to such search and the seizure of the article in question; or
||if he on reasonable grounds believes—
||that a search warrant will be issued to him under paragraph (a) of section 21(1) if he applies for such warrant; and
||that the delay in obtaining such warrant would defeat the object of the search.