Treatment of sick children of Jehovah's Witness and Christian Scientist families at times presents significant dilemmas to American medicine and ethics, for modern healthcare professionals rely heavily on active treatment, and withholding of some treatments is a central religious tenet for Witnesses and Scientists. In important instances, physicians, nurses, ethicists, and courts may wish to set aside traditional religious beliefs and values when medical values support treatment to which adherents of these sects at times object.