Missouri’s 120-Day Shock Incarceration Under Section 559.115 RSMo

Missouri’s 120-day shock incarceration program, created by Section 559.115 RSMo, lets a sentencing judge send someone to prison for a short structured stay, watch how they respond, and then decide whether to release them on probation before the full sentence takes effect. The court keeps jurisdiction for up to 120 days after the person is delivered to the Department of Corrections. If the judge takes no action inside that window, the original sentence runs in full.¹ Only the court can start this process on its own motion. The defendant cannot request it, and neither can the prosecutor.

The Two Versions of the Program

Section 559.115 actually contains two different mechanisms, and the difference changes everything about what a person can expect.

Subsection 2 is the discretionary path. The judge imposes a prison sentence and simply reserves the option to grant probation within 120 days. The court may ask the Department of Corrections for a report, but it isn’t required to, and release is entirely a matter of the judge’s discretion.¹

Subsection 3 is the formal program most people mean when they talk about “the 120-day.” The judge specifically recommends placement in a Department of Corrections 120-day program in the sentencing order. The Department then assesses the person and assigns them to either a structured cognitive behavioral intervention program or an institutional treatment program, based on need and bed space. If the Department reports successful completion, probation is presumed. The probation and parole division notifies the court of the release date 30 days in advance, and the court is expected to follow that recommendation unless it affirmatively decides probation is not appropriate.¹

That presumption is the reason subsection 3 is the stronger route. Under subsection 2 you are hoping the judge lets you out. Under subsection 3 you are presumed to be released if you do what the Department asks of you.

A judge who wants to override a successful completion cannot just enter a written order denying probation. The court must hold a hearing between 90 and 120 days after the person was delivered to the Department.² The hearing requirement is a safeguard against a silent denial after someone did everything the program asked.

Who Can Get It

The statute sets no ceiling by felony class. Any felony conviction can qualify unless a specific exclusion applies. In practice, though, most 120-day candidates are people convicted of lower-level felonies, both because the statutory exclusions eliminate many serious offenses and because judges are more willing to retain jurisdiction when the underlying sentence is shorter.

Offenses Excluded by Statute

Section 559.115 bars probation under the program for these convictions:

Second-degree murder under Section 565.021
Forcible rape under Section 566.030
Forcible sodomy under Section 566.060
First-degree statutory rape under Section 566.032
First-degree statutory sodomy under Section 566.062
First-degree child molestation under Section 566.067 when classified as a Class B felony
Child abuse under Section 568.060 when classified as a Class A felony
Predatory sexual offenders determined under Section 558.018
Any offense where another statute independently prohibits probation or parole

The last item is broader than it looks. A number of serious Missouri felonies carry their own statutory bars on probation, which quietly extends the exclusion list past what Section 559.115 spells out.¹

Practical Barriers

Some barriers sit outside the exclusion list. Someone who already went through the program for the same offense, or during a prior probation term on that offense, usually will not get a second placement. A pending appeal is another block: the court cannot grant probation while an appellate transcript is pending.¹ And a judge who has watched a defendant fail on supervision several times rarely uses discretion to offer this path again.

How the Sentencing Order Triggers It

The written judgment does the work. For subsection 3, the commitment order must recommend placement in a Department of Corrections 120-day program. Without that language, the Department treats the person as a standard prison intake and assigns them to general population. No one at the receiving facility will identify them as a program candidate on their own.

The order also carries the full underlying sentence, which stays in place and will be executed if probation is denied. Restitution, fines, and court costs are documented at sentencing so they can be folded into supervision conditions if release is granted.

Verifying the paperwork before it leaves the courthouse matters. The 120-day clock starts the day the person is delivered to Department of Corrections custody. Administrative errors, misrouted orders, or missing language do not pause that clock.

What the 120 Days Look Like Inside

After arrival, the Department assesses the individual and assigns a track. The structured cognitive behavioral intervention program focuses on thinking patterns and decision-making. The institutional treatment program typically addresses substance abuse or other clinical needs. The Department has sole discretion over track assignment based on its assessment and available bed space.¹

Correctional staff track daily conduct. Compliance with facility rules, participation in assigned coursework, and absence of disciplinary problems all feed into the Department’s eventual finding about successful completion. Fights, contraband, or refusal to participate can produce an unsuccessful report.

If the Department reports unsuccessful completion, the probation and parole division notifies the sentencing court and the prosecuting attorney. The court then decides whether to grant probation anyway or to execute the sentence.² An unsuccessful exit does not automatically mean serving the full sentence. It does remove the presumption of release that successful completion creates.

How the Release Decision Gets Made

When someone completes the program successfully, probation and parole tells the sentencing court the release date 30 days ahead. Before granting probation, the court must notify the prosecution in writing. The state then has ten days to request a hearing. If the prosecution does not respond within ten days, the court proceeds with release.¹

A judge who wants to deny probation despite successful completion must hold a hearing between 90 and 120 days from the delivery date. There is no option to decline by written order alone.¹

The deadline is unforgiving. The statute limits the court’s power to grant probation under this section to a period “up to one hundred twenty days after such offender has been delivered to the department of corrections but not thereafter.”¹ Administrative delay, late reports, and scheduling problems do not extend it. If the window closes without an order granting probation, the sentence runs in full.

What Probation Looks Like After Release

Release from the 120-day program is release onto supervised probation with the Missouri Board of Probation and Parole. The standard conditions are more restrictive than many people expect.³

Report to your probation and parole officer as directed. Missing a scheduled check-in is a violation.
Maintain employment or enrollment in an approved program. Quitting a job requires advance permission, and being fired requires notice within 48 hours.
Get advance approval and a written permit before leaving the state. Out-of-state travel must be discussed with your officer at least 15 days ahead. Sex offenders and those convicted of dangerous felonies must give 30 days’ notice.
Submit to random drug testing. Failing to produce a specimen within the required timeframe, or attempting to dilute or substitute a sample, counts as a violation on its own.
Possess or use no controlled substance without a valid prescription, separate from any criminal charge that might follow.
Pay a monthly intervention fee during supervision.

Beyond the standard conditions, the sentencing court can impose case-specific terms. The Department’s report may include recommendations that the court adopts or modifies.¹

When the Program Is Full

Bed space is limited, and the statute anticipates that. If the court recommends placement but the program is full, the court may place the person in a private program approved by the Department or the court at the person’s expense, or consider other authorized dispositions instead.² A recommendation for placement does not guarantee a spot, and waiting for one does not pause the 120-day clock.

Violating Probation After Release

A probation violation after release from the 120-day program sends you back before the sentencing court. Under Section 559.036, the court can continue probation with or without modified conditions, extend the term, or revoke probation and execute the original sentence.⁴

For people whose underlying conviction is a Class D or E felony or a Chapter 579 drug offense, the statute actually requires the court to place the person in another 120-day program before revoking probation, unless an exception applies. Those exceptions include absconding from supervision, a new arrest, possession or use of a weapon, violating a stay-away order, or having already gone through the program for the same offense during the same probation term.⁴ Many people do not learn about this mandatory second-chance provision until they are already in violation.

If the person consents to revocation or does not qualify for the mandatory program placement, the court can revoke and impose the original sentence. At that point, the full prison term suspended at sentencing takes effect.

1
Missouri Revisor of Statutes. Missouri Code 559.115 – Appeals, Probation Not to Be Granted, When
2
Missouri Revisor of Statutes. Missouri Code 559.115 – Appeals, Probation Not to Be Granted, When
3
Missouri Department of Corrections. Rules and Regulations Governing the Conditions of Probation, Parole and Conditional Release
4
Missouri Revisor of Statutes. Missouri Code 559.036 – Probation Revocation