As an employee of LHS, I can tell you that we combo test (FIV, FeLV) ALL of the cats that come through our doors. We cannot put a cat in a room until it has been tested. FeLV cats can only be adopted to homes with no other cats.
They don't do thetan level testing on their Scientology kittens either.
Contact them directly for an answer to that question. This site does not go to them.
Probably cost plus they figure most people will take animals to their vet.
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