Since cashiers spend so much time eyeing my pesos, I thought I should brush up on how to spot a fake one. Supposedly there a load out there, so if you can't tell the difference here is a good link .
http://santelmoloft.com/2011/07/22/fake-money-in-argentina/
http://santelmoloft.com/2011/07/22/fake-money-in-argentina/