In addition to runaways, family abductions, and nonfamily abductions, there are two other categories that NCMEC handles: lost, injured, or otherwise missing (LIM) and critically missing young adults.
A lost, injured, or otherwise missing child is defined as a child who has disappeared under unknown circumstances or a child who is too young to appropriately be considered a runaway. This ranges from a child wandering off and becoming lost, to child who may have been abducted, but no one saw it happen. These circumstances sometimes involve “foul play”, or those reporting the incident may attempt to cover up a crime involving the child.
Though not legally children, NCMEC also helps law enforcement with cases of critically missing young adults aged 18, 19, and 20. A critically missing young adult is one who is at an elevated risk of danger if not located as soon as possible due to the circumstances surrounding their disappearance.