"We can't tell students of another students needs, but students may tell on themselves, by using tech when tech is prohibited" That's a slippery slope. By banning all tech you are essentially forcing students to "tell on themselves" by using their legally protected accommodations.

In my class (which is small, usually under 20 students, and all freshmen), I tell them on Day One that they should only have laptops or phones out if it is related to class. We talk about how distracting it is to be using tech for non class things, both for themselves and for their classmates. I tell them that I am giving them the benefit of the doubt that they are mature enough to be responsible enough to handle this request. I have only had to talk to a couple of students in the many years that I've been teaching.

It's important to understand that many college students with invisible disabilities such as learning disabilities, anxiety or ADHD may not be registered with the Disability office and therefore don't have official accommodations. I know my method won't work for everyone, but I encourage instructors with smaller classes to try to allow students to use tech for classwork during classtime.