I would like to discuss the search dogs brought in initially. The earliest mention of them was from a Saturday search. Sierra went missing Friday morning.
Doesn't mention that the scent ends at the driveway thats odd. All they say is no trace of her was found.
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How come they didn't follow the scent from her walking to the bus stop on Thursday? Search dogs were brought in the next day. Had they been brought in that day I think it would have improved chances of a scent.
You can look up information on search dogs, one agency claims to have found a scent a week old. So if SL's scent actually ended at the driveway why didn't they continue to the bus stop from the scent from Thursday?
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I understand exactly how the dogs work. Thats why I'm bringing this up. I don't think LE would or is basing anything off of the search dogs because no conclusion was reached. IMO the area has to be terrible for scent dogs to get a scent or she was getting into a vehicle everyday to go to school.
In my other opinion her close friends probably would have known that. Heck we can rule that completely out by talking to the school bus driver right? I don't believe the dogs found anything that can or should be used as evidence.
Oriah or sarx can answer this better but here I am again.
Dogs are trained for various sub-specialties that are all generally called tracking or scent detection. The subset of dogs that we're talking about in this case are dogs that are trained to sniff a personal item belonging to the victim, then search for the freshest scent of that victim.
The reason why they start the dogs at the victim's last known point (in this case, from inside the house) is because the dogs are trained to indicate only on the freshest scent available. If there are older scents from previous days, a trained dog will ignore those scents.
This is actually an easy, beginner level exercise for a dog. When I lived in a medium sized city, the closest area for me to start tracking training for my dogs was a 30 acre park just a block from my house. It was easy to pop up there, lay my tracks, go home, do stuff (to let the tracks age), then get my dog and go track.
I often tracked every day in that park. Particularly when my tracks started getting long relative to the size of the park, I'd be crossing and re-crossing my tracks from previous days and weeks.
It just wasn't a problem. The first session where I crossed over old tracks, my dog would indicate the old track and I'd just stop, tell them "that's not what we're looking for" and go on when they indicated on the correct track again.
And that was it. Problem solved, question answered: what Mom wanted was her freshest track, not any of the older ones.
When we advanced to doing blind tracks, I used either my next door neighbour or my ex-husband to go up to that same park to lay tracks. Needless to say, they crossed and re-crossed their own tracks from previous sessions as well. By that time, my dogs never bothered to indicate on those older tracks; they understood that I only wanted the freshest track and the older tracks would not pay off.
Having dozens or even hundreds of people crossing a given track is a beginner level problem as well. The park I used was great for tracking because the entire back of it was all soccer fields, just acres and acres of open area grass. No obstacles to confuse things for a beginner dog.
I'd go up there early on a Saturday morning to lay my tracks, wait 6-8 hours until all the soccer games had been played, then take my dog up there to follow that morning's track. Again, no problem. Dozens or even hundreds of kids and adults charging back and forth across my track didn't make a difference (except I never had to worry about the cross tracks during a test!).