Prenatal cannabis exposure and the risk of subsequent maltreatment.

Background: Parental substance use can increase the risk of child maltreatment.

Objective: The purpose of this study was to assess racial bias in newborn drug testing and to investigate the association between prenatal tetrahydrocannabinol (THC) exposure and subsequent child maltreatment.

Participants And Setting: This retrospective cohort study (n = 35,437) linked University of Michigan Hospital birth data and Michigan Department of Health and Human Services child maltreatment data relative to a 2018 policy change.