The absolute BEST way to use toads for scenting is to keep them alive. That way you have an ENDLESS amount of toad scent available (everything from urine, shed skin, even feces and best of all, saliva). And if the toad were treated for parasites just like the rest of your collection, you can be assured you have the absolute cleanest source of scent (as long as you keep the toad well fed and clean). Bioaccumulation of environmental contaminants should be a serious, and legitmate concern. Hopefully, keeping one alive will allow the toad to "clean" itself of any toxins, and since no real body parts are being consumed, the likeliness of passing the toxins to your valued snake is decreased.

Fortunately, toads are the easiest amphibians to keep in captivity. A simply 10g, with coconut fiber substrate, a hide spot, and dechlorinated water are the basics.

To answer you questions, 2 weeks is not sufficient. According to the parasite book by Dr Klingenberg, 30 days is the minimum. Even then it will not kill viruses and some bacteria, and certainly will not remove any pesticides.
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*Humans aren't the only species on earth... we just act like it.

".the oldest task in human history: to live on a piece of land without
spoiling it."
Aldo Leopold (1938)

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