New Frontier Data conducted an analysis of data provided by 20 California counties to determine the number of people in California jails for marijuana-related offenses. They found that:
Thousands of adults are incarcerated for marijuana offenses in California and the severity of sentences varies dramatically across the state.
There is significant variation between counties in per capita rates of incarceration and length of sentences for similar offenses.
Black people are significantly overrpresented in the population jailed for marijuana-related offenses.