There's a number of restraining methods that are used with
  special needs kids. (I worked with kids that had cerebral palsy,
  mental disorders, down's syndrome, autism, etc back in the early
  1990s when I was running the Y-RIGHTS (youth rights) mailing
  list on the early Internet. NYRA sprang from my group - I'm so
  proud of you guys). I don't agree with most of these restraining
  methods and CERTAINLY not this one... and _definitely_ *not* by
  police. If you have special needs kids in your classroom, you
  need a special needs teacher and restraints must be VERY limited
  in time. But then to see it's as punishment? Punitive? no no no
  no no no no. It's 2015. We haven't progressed? Apparently we
  haven't.