Should universities and colleges start testing for 'smart' drugs?

I am coming to the end of my univerisity degree and know a few of my peers who use substances such as ritalin to gain an advantage in their ability to concentrate and therefore work harder. I personally think that this puts those people who want to earn their degree themselves at a disadvantage as they don’t want to cheat. Do you think that taking these ‘smart’ drugs is cheating? or is it a student using their own initiative to enhance their performance just the same as say having more omega 3 in their diet?

I am not talking about those people who are prescribed these drugs for a disorder. obviously if the university is testing for these drugs and a student has a ligitimate prescription this is a different matter. I am talking about those students who would not otherwise be prescribed them, getting hold of them illegally.