subdivision (e), which defines “ ‘[cjhildhood sexual abuse’ ” in terms of seven provisions of the Penal Code describing various prohibited sexual acts against minors.
Although plaintiffs are focused on the words “knew,” “reason to know,” and “otherwise on notice” in the statute, it bears emphasizing that these words must, of course, be read in the context of the provision as a whole. Thus, the subject of which the nonperpetrator defendant must have had knowledge or notice is, the statute clearly tells us, the perpetrator’s unlawful sexual conduct as that term is defined in the statute to encompass particular prohibited sexual acts with a minor. As we shall demonstrate, it is the failure of plaintiffs to allege that either the City or the BSA had knowledge or notice that Kalish had engaged in past unlawful sexual conduct that dooms their complaint. Bearing this in mind, we turn to the knowledge and notice language.
The words “knew,” “reason to know,” and “otherwise on notice” are not defined in the statute. The parties agree that “knew” refers to actual knowledge. They agree further that the phrase “reason to know” refers to a species of constructive knowledge, but they disagree as to its exact type.
In their briefing, plaintiffs argued that the phrase imposes a duty of inquiry, a view shared by the Court of Appeal, which defined the phrase in the language of Civil Code section 19: “Every person who has actual notice of circumstances sufficient to put a prudent man upon inquiry as to a particular fact, has constructive notice of the fact itself in all cases in which, by prosecuting such inquiry, he might have learned such fact.” In plaintiffs’ view, the allegations in their complaints that defendants were aware of circumstances that, if investigated, would have revealed Kalish was a child molester are sufficient to charge defendants with constructive knowledge of that fact. At argument, however, plaintiffs appeared to back away from the position and to agree that “reason to know” in the statute has the same meaning we ascribed to that term in John B. v. Superior Court (2006) 38 Cal.4th 1177, 1191 [45 Cal.Rptr.3d 316, 137 P.3d 153]. (See, post, at p. 547.) They shifted their argument regarding the inquiry notice to the “otherwise on notice” language, a point we take up momentarily.
BSA, however, maintains that “reason to know” is a form of “presumed actual knowledge” where “based on facts defendant actually knew, an inference can be drawn that he/she must have realized child abuse was occurring, because a reasonable person would have realized this under the