; or (2) prohibits the introduction of evidence regarding collateral source benefits, or mandates or permits subrogation or a lien on collateral source benefits. (b) Protection of States’ rights and other laws Any issue that is not governed by any provision of law established by or under this title (including State standards of negligence) shall be governed by otherwise applicable State or Federal law. (c) State Flexibility No provision of this title shall be construed to preempt any defense available to a party in a health care lawsuit under any other provision of State or Federal law. 2910. Effective date This title shall apply to any health care lawsuit brought in a Federal or State court, or subject to an alternative dispute resolution system, that is initiated on or after the date of the enactment of this Act, except that any health care lawsuit arising from an injury occurring prior to the date of the enactment of this Act shall be governed by the applicable statute of limitations provisions in effect at the time the cause of action accrued. 2911. Limitation on expert witness testimony (a) In general No person in a health care profession requiring licensure under the laws of a State shall be competent to testify in any court of law to establish the following facts— (1) the recognized standard of acceptable professional practice and the specialty thereof, if any, that the defendant practices, which shall be the type of acceptable professional practice recognized in the defendant’s community or in a community similar to the defendant’s community that was in place at the time the alleged injury or wrongful action occurred; (2) that the defendant acted with less than or failed to act with ordinary and reasonable care in accordance with the recognized standard