Civil procedure: evidence; challenge to statute for failure to follow constitutional procedure; allow consideration of extrinsic evidence. Amends sec. 2113 of 1961 PA 236 (MCL 600.2113) & adds sec. 2113a.

SB 474 changes how Michigan courts handle legal challenges to state laws that may have been enacted without following required constitutional procedures. It creates a rebuttable presumption that statutes complied with procedural requirements (like proper voting), shifting the burden to challengers who must prove otherwise with "clear, satisfactory, and convincing evidence." Courts may also consider outside documents (e.g., legislative records) as evidence in these cases. If a procedural error is confirmed, courts must apply severability rules to separate the effective date from the law's substance. This bill directly affects courts and parties challenging laws' enactment procedures.