Are medical staff allowed to refuse treatment or surgery to someone based on their tattoos?

I've been wanting to get a tattoo for awhile now of the anti-possession symbol Sam and Dean have tattooed in Supernatural, but my friend is convinced that someone will mistake the design for something cult related and refuse to treat me if I ever need surgery or to be in the hospital. Is it true that medical... show more I've been wanting to get a tattoo for awhile now of the anti-possession symbol Sam and Dean have tattooed in Supernatural, but my friend is convinced that someone will mistake the design for something cult related and refuse to treat me if I ever need surgery or to be in the hospital. Is it true that medical staff can refuse to treat you based on tattoos you may have?
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