¬ Patients wearing rate-responsive pacemaker ¬ Over abdomen, pelvis or low back of during pregnancy ¬ Over metal implants; including IUDs ¬ Epileptic patient ¬ Over hemorrhagic area ¬ Over cancerous area ¬ Patients who are confused or unreliable (little kids or elderly who may harm others or themselves in the process) ¬ Over damaged skin.