A California Court of Appeals has held that a person's status as a trespasser is now largely immaterial and no longer determines that he assumed the risk of personal injuries caused by a possessor's negligence.
Beard v. Atchison, Topeka and Santa Fe Railway Company, 4 Cal. App. 3d 130, 84 Cal. Rptr. 449 (1970).
Charles J. Fonzone,
Torts - Assumption of Risk,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol9/iss3/18