Also want to note that, learning from Dylan's case, there are different types of specially trained dogs, air scent, water dogs, etc....
Dogs Rule!
They had a special K9 searching for Lucas.
http://ksn.com/2018/03/01/wpd-k9-following-his-nose-to-help-search-for-lucas-hernandez/
Other K9s have been searching for him, but Blues abilities are unique.
His training in live human scent discrimination allows Blue to get familiar with a persons scent and find it, among many other smells.
The well-trained dog in scent discrimination should be able to find a person even if there are hundreds of other people around such as river festival, said Camp.
Camp says Blue can pick up a scent off of clothing, cell phones, shoes, and even car seats. And hes able to find people after being gone for days.
Ive done trails four to five weeks old and been successful in them, said Camp.