With Respect to Reiki :

Regrettably, I have seen many people throughout the years making a business of selling Reiki certifications who are in reality pseudo-teachers of Reiki. These “teachers” use drugs, alcohol, and/or eat meat, thinking that Reiki can purify their minds and bodies regardless of what they consume, and they go on to teach this to their students. This is very harmful because the energy of Prana, or Reiki, functions according to more subtle laws, such as the law of action and reaction known as Karma in Sanskrit.
What I learned is that any person can transmit Reiki, as long as his actions are pure and lives according to universal truths. This journey is difficult for many because it orders detachment from many things. A reiki practitioner is a servant of the Supreme, therefore he must not contaminate his body and mind in order to transmit Prana in its purest form to the recipient.