great video .
If the Barwig video had gone through that is what we would have tried to illustrate skin rafts which will be in a "cloud" some feet off the actual foot print .
Each body has a unique chemistry which will alter the gases of respiration, sweat , and other , so a man going through a crowd can be isolated , a canine version of where's Waldo.
Disaster search, avalanche , HUSAR which is heavy urban search and rescue for large scale disaster LCSAR - Search and Rescue Dogs
seem to be more and more job opportunities for scent dogs . That is a good thing .