House Bill 2127 amends Tennessee Code Annotated, specifically Title 36, to enhance the legal framework surrounding child custody and the consideration of a child's best interest. The bill introduces new subsections that clarify the admissibility of evidence regarding a parent's or caregiver's conduct prior to the most recent parenting plan, emphasizing that such evidence is relevant if it pertains to the child's best interest. This evidence can include a wide range of documentation, such as sworn testimony, medical records, and police reports. Additionally, the bill mandates that courts give the highest weight to credible evidence of physical abuse, sexual abuse, or domestic violence when determining a child's best interest, applying this standard to any member of the child's household.

Furthermore, the bill establishes a presumption against placing a child with a parent found to have committed physical abuse, sexual abuse, or domestic violence, unless the court provides written findings that rebut this presumption. Courts are required to consider any available protective services records before issuing custody orders. These changes aim to strengthen protections for children in custody cases and ensure that the safety and well-being of the child are prioritized in legal decisions.