MI SB0319

Allows prosecutors to file motions seeking life sentences without parole for defendants who were under 18 when they committed specified serious offenses, including certain drug violations, assault, homicide, and felony murder.

Requires prosecutors to file motions within 21 days after conviction (or 90 days after the act's effective date for prior convictions), with courts conducting sentencing hearings that consider factors from Miller v. Alabama and other relevant criteria.

Mandates sentencing judges to specify aggravating and mitigating circumstances on the record; if courts decline to impose life without parole, they must sentence defendants to 25-40 years minimum with a 60-year maximum.

Applies to defendants convicted before or after the act's effective date (March 4, 2014) if cases remain pending or appeal periods have not expired, with special provisions for cases final before June 25, 2012 if Miller v. Alabama is found to apply retroactively.

Prohibits defendants sentenced under this section from receiving good time credits, disciplinary credits, or other sentence-reducing credits, though they receive credit for time already served.