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"While I believe the concern over a devalued dollar as a result of an unsustainable federal deficit is justified, I am unable to support this legislation," Brewer, a Republican, said in an open letter to state Senate President Andy Biggs.

Brewer noted that the "administrative and fiscal burdens" for taxpayers and the revenue department "remain vague." She also cited uncertainty over whether the legislation would have required the state to exempt transactions involving collectable coins and bills that were authorized by Congress and could be used as legal tender.

"This would result in lost revenue to the state, while giving businesses that buy and sell collectable coins or currency originally authorized by Congress an unfair tax advantage," she said.

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