Section 163

If any person acting with a warrant of arrest issued under section 169 or acting without a warrant of arrest under sections 164, 165 and 166 has reason to believe that any person to be arrested has entered into or is within any place, the person residing in or in charge of the place must, on demand of the person so acting, allow that person free entry to the place and afford all reasonable facilities for search in the place of the person to be arrested.

Where free entry to any place cannot be obtained under subsection (1), it is lawful for a person acting with a warrant of arrest or a military policeman acting without a warrant of arrest where such warrant is not immediately obtainable in order to effect an entrance into the place to break open any outer or inner door or window of any place, whether that of the person to be arrested or of any other person, if after notification of his or her authority and purpose and demand of admittance duly made the person or military policeman so acting cannot otherwise obtain admittance.