Medical malpractice action by P against D Utility Co following the death of X, P's father. from cancer. P's theory is that D caused X's cancer by placing high voltage electrical lines too close to X's residence. D denies that the high voltage lines could have caused X's cancer. At trial. P wishes to call W, an MD (doctor) engaged in cancer research who holds a faculty position at a major research hospital. If permitted. W will testify that the electromagnetic fields produced by high voltage lines are capable of causing cancer. Assume W's view is held by only a small minority of cancer experts. D objects to P's (W's) testimony. How should the court analyze this problem?