"There are so many things that in 1991 did not exist and come 20 years from now there are going to be so many more things that exist that didn't exist today. It's an ever-evolving science," he said. "Science keeps getting better. DNA keeps getting better. Social media keeps getting better. Technology keeps getting better and so have the databases that we can search and the information we can find out. The instant access we didn't have, not to mention the education of law enforcement and the awareness of pressure in abductions have also improved."