Over a decade ago, unelected state officials in Texas arbitrarily decided what percentage of students should get special education services — 8.5 percent — and since then they have forced school districts to comply by strictly auditing those serving too many kids.

Their efforts, which started in 2004 but have never been publicly announced or explained, have saved the Texas Education Agency billions of dollars but denied vital supports to children with autism, attention deficit hyperactivity disorder, dyslexia, epilepsy, mental illnesses, speech impediments, traumatic brain injuries, even blindness and deafness, a Houston Chronicle investigation has found.