Modifies provisions of law relating to custody of in vitro human embryos

HB 613 modifies Missouri law governing custody of in vitro human embryos by replacing outdated definitions and establishing a new custody framework. It defines key terms like "in vitro human embryo" (any embryo not conceived within a female) and "surrogate," while requiring courts to determine custody based on the "best interests of the child" with a rebuttable presumption favoring equal parenting time. This bill directly affects IVF patients, surrogates, and courts handling disputes over embryo custody, as it standardizes how such cases are resolved under family law. The law specifies factors courts must consider, including parental cooperation, child adjustment, and domestic violence history, without altering IVF access or medical procedures.