Casey's Law, officially known as the Matthew Casey Wethington Act for Substance Abuse Intervention, is a Kentucky state law enacted in 2004 that allows the involuntary commitment of individuals for substance use disorder treatment through a civil court process. The law was named in memory of Matthew Casey Wethington, a young man who died of a heroin overdose in 2002. Similar versions of the law have been adopted in other U.S. states, including Ohio.