HB 892 -- Expert Witness Testimony Sponsor: Pratt This bill specifies that a witness qualified as an expert may testify in the form of an opinion if the testimony is based on sufficient facts or data, the testimony is the product of reliable principles and methods, and the witness has applied the principles and methods reliably to the facts of the case. Facts or data need not be admissible in evidence in order for the opinion to be admitted if they are of a type reasonably relied upon by experts in the field in forming opinions or inferences on the subject.Copyright (c) Missouri House of Representatives