[3][4][5] Yarbrough has sponsored the majority of Arizona legislation expanding programs to redirect state income tax liability to tax credits that can be applied toward tuition scholarships for students attending private elementary and secondary schools (scholarship tax credits).

Yarbrough is also the director of one of the largest of those programs, the Arizona Christian School Tuition Organization, from which Yarbrough (the chairman of the AZ Senate Ethics Committee) also receives administration fees, processing fees, and rent.

[6] Yarbrough earned his BS in business administration and finance from Arizona State University and his JD from the Arizona State University College of Law (now the Sandra Day O'Connor College of Law).

It was one of several similar bills in U.S. state legislatures allowing individuals to refuse service based on religion, with some bills specifically protecting religious disapproval of same-sex marriage.

[19] The bill was passed by the Republican-controlled state legislature and vetoed by Republican Governor Jan Brewer on February 26, 2014.