Sen. Cory Booker introduced the Marijuana Justice Act on Tuesday, which aims to legalize marijuana on the federal level. The bill also "incentivizes states through federal funds to change their marijuana laws" if the laws have shown a "disproportionate effect" on low-income citizens or people of color.

Why it matters: Marijuana arrests "account for over half of all drug arrests in the United States," per ACLU data. And Booker said African Americans are almost four times as likely to be arrested for possession as white citizens, despite similar use.

Data: National Conference of State Legislatures, National Organization for the Reform of Marijuana Laws; Cartogram: Andrew Witherspoon / Axios