A single traffic stop can generate two criminal charges when an officer observes signs of impairment and finds controlled substances in the vehicle.
Operating while intoxicated and drug possession are distinct charges prosecuted under different statutes with different evidentiary requirements. Facing both at once is not unusual, and the way they interact, where they diverge, and what can be challenged in each matters from the moment the stop occurs.
Why Drug OWI Is Harder to Pin Than Alcohol OWI
Alcohol-based OWI cases are measured against a defined legal threshold, typically a blood alcohol concentration of 0.08 percent or higher. Drug-related OWI does not work that way.
THC can remain detectable in blood and urine for days or weeks after any impairing effects have long since resolved, which means a positive test does not tell you much about what was happening at the wheel.
NHTSA research on drug-impaired driving confirms that the presence of a drug in a driver’s system does not by itself establish impairment. That gap between detection and impairment is where drug-related OWI cases tend to be more contested than their alcohol equivalents.
The FBI estimates that law enforcement made 804,926 arrests for driving under the influence and 822,488 arrests for drug abuse violations in 2024, making them the two most common arrest categories reported nationally that year.
Two Charges, One Set of Evidence
Prosecutors often file OWI and drug possession as separate counts within the same case, and each count requires independent proof. The OWI count requires evidence of impairment at the time of driving.
The possession count requires proof the defendant knowingly possessed a controlled substance. A toxicology result can support the OWI allegation, but it generally doesn’t establish knowing possession of a physical controlled substance. That is the dynamic Blankenship Law, LLC describes in its Indiana-focused breakdown of what happens when you’re charged with OWI and drug possession. According to their website overview, the drug involved and the amount alleged drive whether the possession count lands as a misdemeanor or a felony, and the same evidence can pull in both directions across the two counts.
That overlap cuts both ways. A successful challenge to the chemical test weakens both the OWI count and any possession charge that relied on those results. A suppression motion that excludes drugs found during a vehicle search can end the possession count entirely and leave the OWI case without its strongest corroborating evidence.
The Traffic Stop Itself Is Often the Whole Fight
Officers need at least reasonable articulable suspicion that a violation or crime occurred before initiating a stop. They cannot extend the stop beyond the time reasonably required to address the original reason for it unless independent suspicion of a separate crime arises during that window. If a vehicle search happened after the stop’s purpose had concluded and before any new basis for suspicion developed, drugs found during that search may be suppressed.
Proving Possession Is Its Own Separate Problem
To convict on possession, the prosecution must prove beyond a reasonable doubt that the defendant knowingly possessed the substance. One can be convicted even when the substance is not exactly on the person’s hands. Constructive possession means the drugs were found in a place where the defendant can control or have access to them. There is a need to prove this constructive possession.
In a vehicle with multiple occupants, proving which person possessed drugs found in a shared space is often where these cases actually get decided. No two drug cases are exactly alike, and the circumstances surrounding a traffic stop can make a significant difference in how a defense is handled. Foley drug crime lawyer Angela Walker and the team take those individual circumstances into account when developing a defense strategy for drug-related charges.
Diversion and What It Requires
Treatment-based alternatives exist, but availability splits sharply by charge. Indiana bars operating while intoxicated from prosecutorial diversion under IC 33-39-1-8, so in a combined case the possession count may qualify while the OWI count does not. Indiana routes impaired driving through a separate conditional deferral under IC 12-23-5, which reaches only misdemeanor charges, requires a license suspension of at least 90 days, and can be used once.
A lot of what determines the outcome of a case gets decided early on. That’s why it matters to know upfront whether diversion, deferral, or another alternative is even an option, especially in cases where an OWI and a drug possession charge come out of the same traffic stop.
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