"Leo's Law" amends the Oklahoma Children's Code to strengthen child safety measures, particularly in relation to drug exposure, especially fentanyl. The bill mandates the Department of Human Services (DHS) to conduct safety analyses when a child is identified as "drug-endangered" and requires drug screenings for caregivers, emphasizing the need for fentanyl testing. If consent for testing is denied, the DHS must notify a district attorney to obtain a court order for the screening. The legislation also establishes the "Child Welfare Fentanyl Testing Revolving Fund" to support drug testing initiatives and requires annual reporting on its activities.

Additionally, the bill modifies the definition of "child endangerment" to include exposure to fentanyl due to caregiver actions, introducing stricter penalties for such cases. It outlines the responsibilities of the DHS in investigating reports of child abuse or neglect, including the development of a "plan of safe care" for infants with Neonatal Abstinence Syndrome or Fetal Alcohol Spectrum Disorder. The bill emphasizes collaboration between DHS and military advocacy programs when a parent involved in an investigation is on active duty and mandates that reports of assessments be forwarded to relevant district attorney offices and military law enforcement. The provisions of the act are set to be implemented by January 1, 2027, and will be funded through existing appropriations.