If relativity theory is correct, no object can travel forward in time at a speed greater than the speed of light  Yet quantum mechanics predicts that the tachyon, a hypothetical subatomic particle, travels faster than light
Thus, if relativity theory is correct, either quantum mechanics' prediction about tachyons is erroneous or tachyons travel backward in time
If the defendant committed the crime, then either the defendant had a motive or the defendant is irrational, for only irrational persons act with no motive. If the psychologist is correct, then the defendant is not rational; on the other hand, according to the evidence, the defendant had a strong motive. Thus, since there is no reason to disbelieve the evidence, the defendant is guilty.