Ritalin is a stimulant for "normal people." For "normal people" incorrectly diagnosed with ADD, Ritalin acts as a stimulant.
For correctly diagnosed ADD people, Ritalin does NOT act as a stimulant, however.
So 10% of the students are walking around taking a stimulant which works similar to methamphetamine, cocaine, etc.
I wonder if any campus killers were on Ritalin?