Luvche, Here's where it addresses chemical peels in the article: "Registered nurses (RN) cannot perform aesthetic procedures independently. Such proceduresrequire an order by a physician. The OklahomaState Board of Medical Licensure and Supervisionha...
PS there are a lot of "schools" that travel around the country training RN's for Peels, Laser, ect. I found this training program as well out of Tulsa: http://www.tulsamedicalspa.com/certification_training.html
I found this in regards to your question:http://www.ok.gov/nursing/newsltr112009.pdf scroll down to page 7. AZ has similar laws, you have to practice "under a physician".