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This is a confusing question as I can't imagine why or how THC would come in contact with leather. Leather doesn't breathe, so no THC could be absorbed by it. If you somehow manage to smoke out of something leather, the resin would stick to the leather, but that's it.
By boat i would imagine.
Leather can be made from pigs
Leather can be made from calves
Leather can be made from deer
Leather can be made from goats
Leather can be made from sheep
Who would have thought mold has its own Kingdom? Saccharomyces is in Kingdom Fungi.
Leather is genuine leather, but watch out as leather look is not the same as genuine leather, if it has come from an animal and has a suede to the underside it is genuine leather.
Leather comes from cowhide.
The leather of most soccer cleats come from kangaroo skins The leather of most soccer cleats come from kangaroo skins
some medicines come from mold like penicillin