Clients having laser hair removal do need to have a consent form on file. This consent form should include information about the procedure, the potential risks and benefits, and the client's agreement. It should also include any relevant medical history or allergies the client may have. Before beginning the treatment, the consent form should be signed by the client and their treating physician or technician. Having a consent form on file ensures that everyone is aware of the potential risks and benefits associated with the treatment and can help protect both parties in the event of any complications.