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Just a thought... but not all dogs are specifically trained as forensic evidence dogs that are trained in all specialties of live search and rescue, decomposition, and forensic evidence.
For reference see this article about the differences in training.
What is the difference between a search dog, cadaver dog, decomp dog and a forensic evidence dog?
FAQ | 911BC K9 Search & Recovery
In Jason's case, has it been specifically stated which type of training/search dog(s) were utilized in the search for Jason? I'd assume that different types of training were utilized, but I don't remember if specifics were ever mentioned.
All MOO