Just for everyones information, you have to be a registered nurse, midwife, Dr or dentist to administer Botox. Training institutions offering courses only take on trainees that are registered with the appropriate governing bodies to practice in the medical field.
So if Botox is being offered anywhere, whether it's a clinic, surgery or salon, then all practitioners will be qualified to do it. If you are having Botox treatments always checkout the person doing the treatments, they should be more than happy to show their certificates etc.