The Coalition for Responsible Home Education, which advocates for tougher homeschool regulation, has a graphic database of homeschool abuses, from starved children to teenagers locked in cages. A 2014 study of extreme child abuse conducted by a University of Wisconsin pediatrician and five colleagues found that in nearly half of the school-age cases, the abusers had pulled their children out of classes to homeschool; another 29 percent had never even enrolled their children in school.