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Tried to find an answer for you.. there used to be a verified SAR expert posting on WS but I haven't seen him/her in a while.
From http://www.ussartf.org/dogs_search_rescue.htm and http://www.vsrda.org/volunteer/faq-2
Interesting points:
-There's a difference between a tracking dog and a trailing dog
-A trailing dog would've been used for this; they require a scent article and the person's last known location
-"Family members of the victim can contaminate a track."
So if they used search dogs at PTL it could've been futile if a) contaminated by TE and b) HE was never physically there, in which case only the car interior would've been alerted to. So if HE's last location was determined to be unknown, it would be a needle in a haystack thing in terms of where to start with a tracking (vs trailing) dog.
The aforementioned SAR expert addressed the fact that dogs are trained to pick up on only the most recent scent, since people frequently question the legitimacy of alerting on a path the victim was already known to take, i.e, "how do we know she walked home from school that afternoon if she walked the same route to school that morning, yesterday afternoon, etc?" He likened it to our own ability to tell whether or not a room needs another spray of air freshener; we can still smell what was sprayed yesterday and how much weaker it is. So imagine that ability amplified 46736473 times in a dog, who can "say" with relative certainty that they're pointing out somewhere the victim was two hours ago rather than 6. (Hopefully I didn't botch his original analogy.)
And the basic answer to your question, as far as I can tell, is that weather and time both can and do destroy scent tracks. But everyone acted relatively fast with HE and I don't think the weather was particularly unkind at the time.
My own question: if they used cadaver dogs at her apartment or PTL and got a hit, would it have been a) released to the public and b) grounds for a search warrant? Or is it pretty much the same amount of evidentiary weight as lie detector tests?
Thank you!!:loveyou: