Civil procedure; testimony of experts; effective date.

HB 2628 modifies Oklahoma's civil procedure rules for expert testimony in court cases. It requires parties (the "proponent") introducing expert witnesses to prove to the court that the testimony is: 1) based on sufficient facts/data, 2) derived from reliable methods, and 3) properly applied to the case facts. This directly affects individuals or organizations involved in civil lawsuits relying on expert opinions, such as in medical malpractice or product liability cases. The law takes effect on November 1, 2025, raising the standard for admitting expert evidence.