Last verified: April 2026
The ACLU Reports: A Decade of Evidence
The definitive research on racial disparities in marijuana enforcement comes from two landmark ACLU studies, a decade apart, that reached the same devastating conclusion.
In 2013, the ACLU published The War on Marijuana in Black and White, analyzing FBI arrest data from every county in America. The findings were unambiguous: Black people were 3.73 times more likely to be arrested for marijuana possession than white people, despite comparable usage rates. The disparity existed in 96% or more of counties studied. It was not a regional phenomenon. It was national.
Blacks were 3.73 times more likely than whites to be arrested for marijuana possession in 2010, despite comparable usage rates. This disparity existed in counties large and small, urban and rural, wealthy and poor, and those with high and low percentages of minority residents.
ACLU, The War on Marijuana in Black and White (2013)
Seven years later, the ACLU's 2020 follow-up, A Tale of Two Countries: Racially Targeted Arrests in the Era of Marijuana Reform, found the picture had barely changed — and in many places, worsened. The nationwide disparity stood at 3.64 times. The disparity existed in every single state. In 31 states, racial disparities had actually increased since the first study.
The Most and Least Disparate States
While the disparity is universal, its severity varies enormously. At the extremes:
Most disparate states (Black-to-white arrest ratio):
- Montana — 9.6x (highest in the nation)
- Kentucky — 9.4x
- Illinois — 7.5x
- West Virginia — 7.3x
- Iowa — 7.3x
Least disparate states:
- Colorado — 1.5x (lowest, post-legalization)
- Alaska — 1.6x
- Hawaii — 1.8x
Even in the "best" state — Colorado — Black residents are still arrested at 1.5 times the rate of white residents. There is no state in America where cannabis enforcement is racially equitable.
Legalization Has Not Eliminated the Disparity
One of the most troubling findings is that legalization reduces total arrests but does not eliminate racial disparities. In states that have legalized, remaining enforcement actions — public consumption, unlicensed sales, possession over the legal limit — still fall disproportionately on Black communities.
The most current data underscores this. By 2023, Black Americans constituted 14% of the U.S. population but 41% of marijuana possession arrests. In 2024, that figure rose to 42%, according to Filter Magazine's analysis of FBI data. The ratio has worsened even as total arrests have declined.
Despite legalization spreading across the country, the share of marijuana possession arrests falling on Black Americans has increased from 35% (2010) to 42% (2024). Fewer arrests total, but a larger share targeting Black communities.
Equal Usage, Unequal Enforcement
The disparity cannot be explained by differences in cannabis use. The National Survey on Drug Use and Health consistently shows that Black and white Americans use marijuana at similar rates. In some age groups, white Americans use cannabis at higher rates. Yet arrest rates diverge by a factor of nearly four.
Researchers point to several enforcement patterns that drive the disparity: disproportionate police presence in communities of color, pretext stops that escalate to searches, differences in where cannabis is consumed (private homes vs. public spaces), and implicit bias in discretionary enforcement decisions. The disparity is not about who uses cannabis. It is about who police choose to arrest.
The Fundamental Injustice
The racial disparity in cannabis arrests creates the core moral argument for expungement. People — disproportionately Black Americans — are serving sentences, carrying records, and facing lifelong consequences for conduct that is now legal where they live. In many cases, the very states that arrested them at the highest rates have since legalized cannabis and are generating billions in tax revenue from the same substance.
Illinois recognized this directly: its Cannabis Regulation and Tax Act explicitly tied expungement provisions to the racial impact of enforcement, directing cannabis tax revenue toward communities most harmed by the War on Drugs. It remains the model for addressing the historical disparity — but most states have not followed suit.
Until every state confronts the racial dimension of its cannabis enforcement history, expungement remains not just a policy goal but a matter of racial justice.
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