"But as it turns out, the parents most likely to apply for these vouchers are the ones who were already sending their kids to private school or homeschooling. They use the dollars to subsidize what they were already paying for."
School Vouchers Were Supposed to Save Taxpayer Money. Instead They Blew a Massive Hole in Arizona’s Budget.
https://www.propublica.org/article/arizona-school-vouchers-budget-meltdown