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OK, from a canine search and rescue perspective, which I was a trailing handler for 25 years, I did not talk about scent articles. Here is the scent article scoop. Only the subject should create the scent article.

1. Use unscented zip-lock plastic bags, sandwich or quart freezer. 3 or more.
2. Use unscented kleenex / tissue. Rub in arm pit, nape of neck, crotch (no feces). Idea is to get some good sweat/scent on the tissue. You can even throw in clothing pieces if you want - I have used underwear articles and socks. I even used car seats a few times.
   
3. Place tissue in zip lock bag - 1 to 2 per.
4. Place multiple zip locks into a larger zip lock, gallon size.
5. Mark outside of large zip lock with subject's name.
6. Place bag at floor of vehicle out of direct sun as much as possible.
   

You can further note on the bag, "Collected per CARDA handler guideline." I am CARDA 169. This later will tell SAR teams the quality of the scent article. Worst thing to do is put the scent article in a paper bag, which is porous and will collect other scents in the area. Placement on vehicle floor is good. As for temperature, it should be acceptable. I have actually had my dog work with a scent article that was in my car for a year before being used. It was kept in a zip lock bag the entire time.

Key is to avoid getting anyone else's scent on the scent article. Even the exterior of the bag can hold scent. I have worked with contaminated scent articles, but there are limitations and details that must be followed to ensure the scent article can be used with reliability.

I can discuss more if people want. I am currently working on a book on how to train trailing dogs. Scent article collection will be contained within.

Two Dogs