On TV yesterday there was a story about missing children quoting figures of 40,000 per year as runaways and 17,000 being abducted or missing for some other reason. The missing children organization that was being interviewed advocated a child identity kit that included identity information to be kept up to date and included a DNA sample collected from the child. The kit was to be provided to authorities if a child went missing.
Here are some other examples of this trend:
http://www.sfuo.org/uin.html
http://www.fingerprintamerica.com/c_genetikid.asp