I agree that ADD and ADHD is greatly overdiagnosed, and in many cases could be cured with a paddle.
Special ed can cover a wide range of things, and indeed, a special ed finding can mean more funding and lower failure rates on the standardized tests, so schools have an incentive to identify SE kids.
On the other hand, number of folks move to our district because it has one of the best autism programs in the country.
Go back & read NCLB. With the exception of the profoundly retarded and disabled, most special ed students are now supposed to be able to pass the same standardized tests as the regular kids.
Some probably can, some never will.