For instance, there was the private "school" whose students watched videos and cartoons all day, and the one run by a convicted sex offender.
Some shysters began private "schools" to get the voucher money, but didn't bother teaching anything at all. At least some of them were eventually caught.
I would like the government to have some management oversight about where this money goes. But people who take money and provide no value should be cut off and (when appropriate) charged with a crime.