Ultra, here's the link to that finding (reported in USA Today a while back) :
http://www.usatoday.com/news/health/2010-08-17-1Aadhd17_ST_N.htm .
Teachers are not allowed to diagnose anything, nor are they to recommend meds. They're not qualified to do it, and it's inappropriate. IMO parents of young-for-grade children need to be attentive to these issues, but also ready to stand up (nicely) to teachers who cross that line. I don't think this is a "risk" in that the decision to diagnose and/or medicate ADHD is that of parents and health care providers, NOT schools.
DeeDee
