Empirical research is research using empirical evidence. Such claims have no supporting medical evidence. Questions were raised concerning issues ranging from witness tampering to the planting of evidence. Charges were dismissed for lack of evidence. The episode dealt with circumstantial evidence and jury nullification. The charges were dropped due to lack of evidence. He has demanded a retrial for the case on the basis of false evidence. He based teaching practices on empirical evidence and measurement. Allegations of suppression of UFO related evidence have persisted for many decades. These charges were dropped for lack of evidence. The charges were dropped due to a lack of evidence. Unfortunately, no further concrete evidence surfaced in the massacre case. Raborn was unsuccessful in finding such evidence. The quality of the underlying evidence was also poor. Confirmation biases are not limited to the collection of evidence.