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Yes, it is legal.
A chiropractor may, as part of his or her practice, manipulate the muscle and connective tissue using manual and mechanical techniques, which is what a TENS unit does.
Just FYI -- you will not find any rule, statute or other law that explicitly says a chiropractor may prescribe TENS treatment. Rather, the ability of a chiropractor to do so stems from the more general grant of authority already noted to you.
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