What is the burden of proving that room 219 was used as a cocaine factory?

The prosecution must prove that appellant opened or maintained room 219 for the purpose of selling the cocaine base. "Even where the statute provides that the unlawful possession of intoxicating liquor is prima facie evidence that such intoxicating liquor is possessed for the purpose of unlawful sale or disposition [which the court stated earlier in its opinion that the California [8 Cal.App.4th 492] statute does not], the presumption does not arise that the place or establishment where the liquor is kept, is conducted as a common nuisance, or is maintained as a place for the unlawful sale of intoxicating liquor." (People v. Mehra, supra, 73 Cal.App. at p. 171, 238 P. 802.)