"Among all state and federal prisoners (1,421,700), nearly 4 in 10 (38%) reported using drugs and 3 in 10 (30%) reported drinking alcohol at the time of the offense for which they were serving a sentence (figure 1, table 1)."
Source
Laura M. Maruschak, Jennifer Bronson, PhD, and Mariel Alper, PhD. Alcohol and Drug Use and Treatment Reported by Prisoners: Survey of Prison Inmates, 2016. US Dept. of Justice Bureau of Justice Statistics. NCJ Number 252641. July 2021.