Okay, I just found a link to the National School Boards Association concerning the topic I wrote about a couple of days ago (that is, schools requiring students to take Ritalin in order to attend classes). There it describes the Child Medication Safety Act, which states that all states that receive federal funding must prevent local schools from coercing parents to put their kids on any psychotropic drug. It was passed by the House in 2003. So, in answer to my question, schools are not really permitted to coerce parents to give their children Ritalin. The complete text of the Bill can be seen on that site.