No evidence, speaking from personal experience and the belief that ADD is over diagnosed.
I don't find it hard to believe there are millions of students unable to focus in public school. What I find hard to believe is that medication is the answer. Sure its an easy answer for those teachers to have their students sit quietly in the classroom for 50-90 minutes with little interruption and be expected to focus on subjects that relate little to their life with little or no control over what and how they study. I was diagnosed with ADD, and I had these views about 12 years ago to when I was diagnosed. I'll stick to cabbage, green tea, and the occasional meditation to help with my so called add.
"I therefore all" is clearly a fallacy although a very popular one. It is really a form of anecdote and deserves no more weight than any other particular anecdote.
Stated with such certainty. What evidence do you have that the commenter here in particular didn't develop in some way as they grew up?
This doesn't take away from your views that there may be problems with the education system but to declare that there are no cases of real medical issues in this area seems a bit presumptive.