State and Statute: California, Penal Code 11164 et seq. (originally enacted in 1987; statute language affecting what appears here most recently amended in 2017; all language verified here as of November of 2017)

What Is Reportable "Abuse": Physical, sexual, or mental abuse, or neglect (but child abuse does not include "mutual affray between minors"). The reporting duty "shall apply even if the victim of the known or suspected abuse has reached the age of majority by the time the required report is made." [11165.1-11165.6]