He may break open any outer or inner door or window of a house, for the purpose of liberating a person who, having entered to aid him in the execution of the warrant, is detained therein, or when necessary for his own liberation.
Cal. Penal Code § 1532
Of Search Warrants
Enacted 1872.
Official source: California Legislative Information. Reproduced from public-domain California statutes; confirm against the official source for the current text. Not legal advice.