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 a 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.