Is a police officer required to announce, demand entry and await refusal at each inner door?

[67 Cal.App.4th 976] Moreover, once the officers have complied with knock-notice at the initial entry, repeated knock-notice at inner doors would increase, rather than decrease, the probability of violence by giving any occupant predisposed to resist an entry by police additional time to prepare. (People v. Howard, supra, 18 Cal.App.4th at p. 1552, 23 Cal.Rptr.2d 212; United States v. Bustamante-Gamez, supra, 488 F.2d at pp. 10-11.) "Requiring police who have lawfully entered a house to announce, demand entry and await refusal at each inner door is in conflict with the statutory purpose of reducing violence." (People v. Howard, supra, 18 Cal.App.4th at p. 1553, 23 Cal.Rptr.2d 212; People v. Aguilar, supra, 48 Cal.App.4th at p. 638, 55 Cal.Rptr.2d 716.)