The Statute Creates Two Distinct Offenses

Maryland law does not treat all impaired driving the same way. Under Transportation Article Section 21-902, the more serious offense applies when a driver’s blood alcohol concentration reaches 0.08 percent or higher, or when a person is under the influence of alcohol per se. A lesser offense applies to driving while impaired by alcohol, generally covering blood alcohol levels between 0.07 and 0.08 percent, or other observed impairment that does not reach the higher threshold.

This two-tier structure means the exact number returned by a chemical test can determine which specific charge someone actually faces in court, which is why the accuracy and administration of that test become central issues in nearly every single case that goes to trial.

Why the Distinction Actually Matters

The gap between these two charges affects far more than terminology. The more serious charge carries steeper potential penalties, including greater fines and longer possible jail time for a first offense, compared to the lesser impairment charge. A Maryland DWI attorney reviewing a case will often focus heavily on the actual chemical test results and how they were obtained, since the specific number can determine which charge a person is realistically facing.

Implied Consent Shapes the Testing Process

Maryland operates under an implied consent framework, meaning that by driving on Maryland roads, a person has already agreed to submit to chemical testing if lawfully arrested. Refusing a test triggers automatic license consequences separate from the criminal case itself, and that refusal can also be introduced as evidence in court. This creates a difficult decision point at the moment of arrest, since both submitting to testing and refusing it carry consequences that follow different paths.

What Happens If You Refuse the Test

A first refusal generally results in a license suspension measured in months, while subsequent refusals carry a suspension that extends to a full year or longer under the statute. This administrative consequence is handled separately from the criminal charge and moves on its own timeline, which means a person can face license consequences well before the underlying criminal case is ever resolved in court.

Ignition Interlock Requirements Have Expanded

Maryland’s ignition interlock law, sometimes referred to by its popular name, has expanded the circumstances under which a device is required following a conviction. Depending on the specific circumstances and any prior record, a court may prohibit a person from operating a vehicle without an interlock device installed for a defined period following conviction, which can add real practical burden even after other penalties have concluded.

The Evidence That Tends to Shape These Cases

A handful of factors consistently matter most in how these charges are evaluated:

  • The specific chemical test result and the calibration records for the testing device
  • Body camera or dashcam footage from the traffic stop itself
  • Field sobriety test documentation and how it was administered
  • Any procedural issues with the initial stop or the arrest itself

Because the numeric threshold separating the two charges is so specific, challenges to how a test was administered or calibrated can meaningfully affect the outcome of a case.

Getting an Early Read on Your Charges

Understanding which specific charge you are facing, and what evidence the state actually has to support it, shapes every decision that follows. A Maryland DWI attorney reviewing your case can identify exactly where the evidence may be vulnerable to challenge.

Working With a Firm That Regularly Handles These Cases

The Law Firm of Frederick J. Brynn, P.C. has represented clients throughout Maryland facing impaired driving charges and can walk through the specific evidence in your case. If you are facing a charge like this, getting an early review of the testing and arrest procedures gives you a clearer sense of your actual options.