A Maryland DUI charge does not require alcohol. Drivers can be charged with driving while impaired by a controlled dangerous substance (CDS), including certain illegal drugs and prescription medications. These cases often involve officer observations, field sobriety testing, blood analysis, and allegations that a substance affected a driver’s ability to operate a vehicle safely. In Annapolis and throughout Maryland, a CDS-impaired driving charge can result in criminal penalties, license consequences, and lasting effects on your record and future opportunities.
Controlled Dangerous Substance Cases Are Often Built on Assumptions
Unlike alcohol-related DUI cases, there is rarely a universally accepted measurement that proves a driver was impaired by a controlled dangerous substance at a specific moment in time. Instead, prosecutors often rely on a combination of observations, field sobriety testing, blood test results, and expert opinions to build their case.
At Hartman Attorneys at Law, we focus on the evidence that matters most:
- Examining whether the traffic stop was lawful
- Evaluating field sobriety testing and officer observations
- Reviewing Drug Recognition Expert (DRE) evaluations for weaknesses
- Analyzing blood testing procedures and laboratory results
- Challenging assumptions that equate drug presence with impairment
Because these cases frequently involve interpretation rather than objective measurements, the details matter. Our goal is to identify gaps in the State’s evidence and build a defense focused on what prosecutors can actually prove—not what they assume happened. Call today to discuss your case and your options.
What Is a Controlled Dangerous Substance Under Maryland Law?
A controlled dangerous substance is a drug regulated under Maryland law due to its potential for abuse, dependence, or impairment. Common examples include:
- Cocaine
- Heroin
- Methamphetamine
- Opioid pain medications
- Benzodiazepines and anti-anxiety medications
- Certain stimulants
Cannabis occupies a unique position under Maryland law. While adult possession of limited amounts of marijuana is legal, driving while impaired by cannabis remains a criminal offense. A driver can still face DUI-related charges if prosecutors believe marijuana affected their ability to drive safely.
Can You Be Charged If You Have a Valid Prescription?
Yes. Many people assume that a prescription automatically protects them from criminal liability. Maryland law focuses on impairment, not whether the substance was legally obtained.
A driver may face charges if prosecutors believe a prescribed medication affected their ability to operate a vehicle safely. This can include medications used to treat anxiety, insomnia, pain, or attention disorders.
At the same time, prescription cases often present unique defense opportunities because side effects, dosage instructions, medical history, and alternative explanations may become important evidence.
How Do Police Investigate Controlled Dangerous Substance DUI Cases?
Most CDS-impaired driving investigations begin with a traffic stop. After making contact with the driver, officers may look for signs of impairment, including physical appearance, speech patterns, coordination, and driving behavior. If they suspect drug impairment, they may request field sobriety testing or involve a Drug Recognition Expert.
Police may also seek blood testing to identify the presence of controlled substances. Unlike alcohol investigations, these cases frequently rely on a combination of observations and testing rather than a single piece of evidence.
How Is Impairment Proven Without a Breath Test?
This is one of the most important issues in a controlled dangerous substance case. Unlike alcohol-related DUIs, there is generally no universally accepted measurement that automatically establishes impairment. A blood test may show that a substance is present, but presence alone does not necessarily prove a driver was impaired.
Prosecutors often attempt to connect:
- Driving behavior
- Officer observations
- Field sobriety testing
- DRE conclusions
- Blood test results
The defense may challenge whether those pieces of evidence actually establish impairment at the time of driving.
Common Defenses to Controlled Dangerous Substance DUI Charges
Every case is different, but common defense strategies may include:
- Challenging the legality of the traffic stop
- Disputing field sobriety test conclusions
- Questioning DRE evaluations
- Challenging blood testing procedures
- Identifying medical explanations for observed behavior
In many cases, the defense focuses on whether the State can prove impairment rather than merely the presence of a substance.
Protect Your Future After a Controlled Dangerous Substance DUI Charge
If you have been charged with driving while impaired by a controlled dangerous substance in Annapolis or anywhere in Maryland, contact Hartman Attorneys at Law. We can review the evidence, explain your options, and help you build a defense focused on protecting your license, your record, and your future.