The data was not interpreted as a decrease by anti-marijuana groups, who said use remained higher in legal states than the rest of the U.S.
Federal and state laws concerning the drug are at odds.
The attorney general has long been an opponent of cannabis legalization.
When cannabis businesses come into neighborhoods, crime goes down, not up.
Senator Booker said he wants to correct an “unjust system” that largely impacts communities "of color."
Sessions wants to undo the amendment that prevents the Justice Department from spending money to prosecute those in line with state medical marijuana laws.