What Happens if Your BAC Is Over .15% in a Missouri DWI Case?

When someone is arrested for DWI in Missouri, the blood alcohol content (BAC) at the time of arrest can significantly affect the potential penalties and sentencing options. A BAC of .15% or higher triggers enhanced restrictions that eliminate some of the most favorable outcomes available to first-time offenders and increase mandatory minimum jail time.

At Rose Legal Services, we represent individuals facing DWI charges with elevated BAC levels throughout Missouri. Understanding how a high BAC affects the case is critical because it determines eligibility for suspended imposition of sentence, mandatory jail time, and treatment program requirements.

The .15% BAC Threshold in Missouri Law

Missouri law treats DWI cases differently when the defendant’s BAC is .15% or higher. This threshold is nearly twice the legal limit of .08%, and Missouri statutes impose specific restrictions and requirements for these cases.

A BAC of .15% means that a person has fifteen-hundredths of one percent by weight of alcohol in their blood. For context:

• .08% is the legal limit for driving in Missouri
• .15% is nearly twice the legal limit
• .20% is two and a half times the legal limit

These elevated BAC levels indicate significant alcohol impairment and trigger more serious consequences under Missouri law.

Restrictions on Suspended Imposition of Sentence

For first-time DWI offenders, a suspended imposition of sentence (SIS) is typically the best possible outcome. With an SIS:

• The person pleads guilty or is found guilty
• The court does not enter a conviction
• The person is placed on probation
• If probation is successfully completed, the case is closed without a conviction

However, Section 577.010.3(2), RSMo imposes an additional requirement for first-time offenders with a BAC of .15% or higher:

“In a circuit where a DWI court or docket created under section 478.007 or other court-ordered treatment program is available, and where the offense was committed with fifteen-hundredths of one percent or more by weight of alcohol in such person’s blood, unless the individual participates in and successfully completes a program under such DWI court or docket or other court-ordered treatment program.”

This means that if:

• The person wants a suspended imposition of sentence, AND
• Their BAC was .15% or higher, AND
• A DWI court or treatment program is available in that circuit

Then the person must participate in and successfully complete the program to receive an SIS.

What Are DWI Courts and Treatment Programs?

DWI courts are specialized court dockets established under Section 478.007, RSMo that provide intensive supervision and treatment for individuals charged with alcohol-related offenses.

These programs typically include:

• Frequent court appearances before a dedicated judge
• Substance abuse assessment and treatment
• Regular alcohol testing and monitoring
• Case management and supervision
• Graduated sanctions and incentives based on compliance
• Peer support and group counseling

DWI courts are not available in every Missouri circuit, but they are offered in some jurisdictions, including certain courts in the St. Louis area. The availability of these programs varies by location.

If a DWI court or other court-ordered treatment program is not available in the circuit where the case is pending, this additional requirement does not apply, and a person with a BAC of .15% or higher may still be eligible for an SIS under the standard two-year probation requirement found in Section 577.010.3(1), RSMo.

Mandatory Minimum Jail Time for High BAC Cases

If a first-time offender is not granted a suspended imposition of sentence, mandatory minimum jail time applies based on the BAC level at the time of arrest.

According to Section 577.010.5, RSMo:

BAC Between .15% and .20%

“If the individual operated the vehicle with fifteen-hundredths to twenty-hundredths of one percent by weight of alcohol in such person’s blood, the required term of imprisonment shall be not less than forty-eight hours.”

This means a minimum of two full days in jail.

BAC Greater Than .20%

“If the individual operated the vehicle with greater than twenty-hundredths of one percent by weight of alcohol in such person’s blood, the required term of imprisonment shall be not less than five days.”

This is a minimum of five full days in jail.

These are mandatory minimums. The judge has no discretion to impose less jail time if the person is not granted an SIS and their BAC was at these levels.

However, if the person does receive a suspended imposition of sentence (and completes any required DWI court or treatment program), these mandatory minimum jail sentences do not apply.

How High BAC Affects Prior and Repeat Offenders

While the .15% threshold primarily affects sentencing restrictions for first-time offenders, elevated BAC levels also matter for repeat offenders.

According to Section 577.010.4, RSMo, “If a person is found guilty of a second or subsequent offense of driving while intoxicated, the court may order the person to submit to a period of continuous alcohol monitoring or verifiable breath alcohol testing performed a minimum of four times per day as a condition of probation.”

Section 577.001(7), RSMo defines “continuous alcohol monitoring” as “automatically testing breath, blood, or transdermal alcohol concentration levels and tampering attempts at least once every hour, regardless of the location of the person who is being monitored, and regularly transmitting the data.”

For repeat offenders with high BAC levels, courts are more likely to impose these intensive monitoring conditions as part of probation.

Driver License Implications

In addition to the criminal penalties, a DWI with a high BAC affects driving privileges.

If someone is arrested with a BAC of .08% or higher, the offense is processed administratively as well as criminally. The administrative suspension or revocation occurs separately from the criminal case.

For a first-time DWI conviction, the driver’s license suspension is 90 days. However, the administrative suspension based on the BAC test results may occur even before the criminal case is resolved.

A person may be eligible for a Restricted Driving Privilege (RDP) during the suspension period, which allows limited driving for work, school, medical appointments, and other essential purposes.

Why High BAC Cases Require Experienced Defense

A DWI charge with a BAC of .15% or higher presents unique challenges:

• Limited sentencing options compared to lower BAC cases
• Mandatory jail time if SIS is not granted
• Required participation in treatment programs in some circuits
• Increased scrutiny from prosecutors and judges
• Greater difficulty negotiating favorable plea agreements

An experienced DWI attorney can:

• Challenge the accuracy and reliability of BAC test results
• Examine whether proper procedures were followed in administering breath or blood tests
• Investigate whether the testing equipment was properly calibrated and maintained
• Advocate for admission to DWI court or treatment programs
• Present mitigating factors that support an SIS despite the high BAC
• Protect constitutional rights throughout the process

At Rose Legal Services, we dedicate our practice exclusively to criminal defense. DWI is our most common type of case and makes up 40% of our caseload. All of our attorneys have completed the same DWI training as law enforcement officers, and we understand how to challenge BAC evidence and advocate for the best possible outcomes in high BAC cases.

A High BAC Doesn’t Mean the Case Is Lost

A BAC of .15% or higher creates additional obstacles, but it does not mean a conviction is inevitable or that jail time is unavoidable. Many high BAC cases are resolved with suspended imposition of sentence through successful completion of treatment programs, effective legal advocacy, and strategic case management.

Rose Legal Services represents individuals throughout Missouri who are facing DWI charges with elevated BAC levels. We understand the enhanced restrictions, mandatory minimums, and treatment requirements that apply to these cases, and we work to achieve the most favorable outcome possible.

Your defense starts with a conversation.