Every state has their unique laws regarding the type of provider that can perform injections. The Botox injector should be experienced, have an excellent understanding of the anatomy, and be supervised, preferably, by the doctor. There are many excellent nurses and PAs (physician assistants) in doctors offices (dermatologists and plastic surgeons) that perform these injections, some with greater experience than doctors that don't do much of this treatment.
Having performed thousands of Botox injections since 1993, I continue to learn and perfect my technique. There is much art and science involved with relaxing facial musculature. It is not as simple as reading a book about doing it and then treating patients. If a nurse of PA is doing the treatment, they need to have had formal and extensive training in the delivery of Botox or Dysport injections,