In Fiscal Year 2015, according to the US Sentencing Commission:
"In 22.2% of all cases, the offender was convicted of an offense carrying a mandatory minimum penalty.
" Drug trafficking offenses accounted for over two-thirds (66.2%) of the offenses carrying a mandatory minimum penalty, followed by firearms (15.4%) and child pornography offenses (8.8%).
" Almost 40 percent (39.2%) of offenders convicted of an offense carrying a mandatory minimum were relieved of the mandatory minimum penalty because:
" 20.3% received relief solely by providing the government with substantial assistance;2
" 13.0% received relief solely through the statutory safety valve provision,3 and
" 5.8% received relief through both the statutory safety valve provision and by providing substantial assistance to the government.
" After relief was applied, 60.8% of these offenders remained subject to a mandatory minimum penalty at sentencing, reflecting 13.5% of all federal offenders."
US Sentencing Commission, Quick Facts on Mandatory Minimum Penalties, May 2016.