Mandatory minimum sentencing provisions have long been a feature of the US justice system. In the Crimes Act of 1790, seven offenses, such as treason, carried a mandatory death penalty: 1 that is, upon convicting a defendant for treason, the minimum sentence a judge could impose was death. From 1790 to 1950, federal mandatory minimums grew slowly and "generally targeted crimes that were infrequent" and "decisively federal in nature", like piracy. 2 With the onset of the war on drugs, mandatory minimums became a more signi cant feature of the justice system: "Congress passed harsh drug-related mandatory minimums in 1951 and 1956, repealed them in 1970 […], then passed them again in a biennial fashion, beginning in 1984". 3 Federal mandatory minimums have grown explosively under the war on drugs, 4 become more severe, and targeted crimes that were frequent and also punishable under state laws. The effects of this trend are myriad. Most obviously, many prisoners are subject to drug-related mandatory minimums. In 2016, 22% of offenders in the federal system were convicted of an offense carrying a mandatory minimum and 67% of those offenders were convicted of drug traf cking; 5 of the remainder, many were also subject to mandatory minimums due to the war on drugs under rearms and "career offender" provisions. 6 It would be misleading to focus only on the federal system since "half of all federal prisoners are serving time for drug crimes". 7 State legislatures also passed and expanded mandatory minimums signi cantly during the war on drugs and in some cases due to the in uence of federal crime policy. 8 Drug offenders were 6.5% of the state prison population in 1980; this rose to 22% in 1990 before dropping to 16% today.