Montgomery County is unusual, if not unique, in creating such a program.

In a science class at Lakelands Park Middle School, 13-year-old Mike Keller sat between his professional aide and his science partner during a lesson about how force affects balance. The Montgomery County teen, who has autism, stood up a few times in a burst of energy and once walked out of the room. But with some redirection from his aide, he appeared to focus on a series of questions that his teacher posted on the whiteboard.
His teacher asked him an easy yes-or-no question at one point, and as an aide held a keyboard in front of him, Mike typed the word “Yes” on the iPad, followed by a touch of sarcasm: “Duh.”
Mike is not able to speak. He points at letters on a laminated alphabet board or types on a keyboard that an aide holds. Nationally, most students who can’t talk are in self-contained classrooms or autism programs or, like Mike used to be, in a separate school for students with severe disabilities.
But five years ago, Mike and his mother traveled to Texas to explore a novel communication technique called Rapid Prompting Method that led to what his family describes as a breakthrough. About a year later, he joined a new pilot program in Montgomery County Public Schools for autistic students who rely on keyboards and communication partners...

https://www.washingtonpost.com/local/social-issues/parents-of-autistic-children-are-pushing-schools-to-allow-controversial-communication-techniques/2017/02/28/1bd33da2-ed6a-11e6-9973-c5efb7ccfb0d_story.html?utm_term=.1df8072f08f7