Mandatory Minimum Sentences

A mandatory minimum requires a judge to impose at least a specified prison term once a defendant is convicted of a certain crime, regardless of the circumstances. Federal mandatory minimums date to the 1790s but became central with the Anti-Drug Abuse Act of 1986, passed after the cocaine overdose death of basketball star Len Bias, which tied five- and ten-year minimums to drug quantities and created a 100 to 1 disparity between crack and powder cocaine. Gun laws add consecutive minimums for using a firearm in a drug or violent crime.

The Sentencing Reform Act of 1984 abolished federal parole and created sentencing guidelines, made advisory by the Supreme Court in United States v. Booker in 2005, but mandatory minimums still bind judges. Because prosecutors choose what to charge, they decide whether a minimum applies, which gives them leverage in plea bargaining. A safety valve lets judges go below drug minimums for some low-level offenders, and defendants who help prosecutors can also escape them.

The number of federal prisoners grew from about 25,000 in 1980 to about 220,000 in 2013 before declining, driven largely by drug sentences. Supporters say minimums ensure tough, consistent punishment, protect communities, and encourage cooperation against higher-level traffickers. Critics, including many judges, say they produce unjust sentences for minor participants, fell hardest on Black defendants, and shift power from judges to prosecutors. Congress reduced some minimums in 2010 and 2018 and has added new ones, such as for fentanyl.