First published by Money Metals here: https://www.moneymetals.com/news/2017/05/23/az-ends-taxation-bullion-coins-001079

Sound money advocates rejoiced today as House Bill 2014 became the law in Arizona. HB 2014, which passed in the Arizona state Senate on May 10th by a margin of 16-13, removes all income taxation of precious metals coins at the state level.