DUI Is Not Always About Alcohol
When many people hear the term “DUI,” they immediately think of drunk driving involving alcohol. While alcohol-related DUI cases are common, California law also addresses situations where a driver is accused of being impaired by drugs, prescription medication, cannabis, or a combination of substances.
A DUI allegation involving drugs can look very different from a traditional alcohol DUI case. The methods used to investigate impairment, the evidence involved, and the legal questions that arise may vary depending on the substance involved.
Understanding the difference between a drunk driving DUI and a drugged driving DUI can help people better understand how these cases are investigated and evaluated under California law.
What Is Considered a DUI in California?
California law prohibits driving under the influence of alcohol, drugs, or both. Under California Vehicle § Code 23152, a person may face DUI charges if they allegedly operate a vehicle while impaired by alcohol, drugs, or a combination of substances.
A DUI case generally involves questions about:
- Whether the person was driving a vehicle
- Whether alcohol, drugs, or both were involved
- Whether the substance affected the person’s ability to operate the vehicle safely
California recognizes several types of DUI cases, including:
- Alcohol-related DUI
- Drug-related DUI
- Combined alcohol and drug DUI
- DUI involving prescription medications
- DUI involving cannabis or other controlled substances
The important issue is not simply whether a substance was present. In many cases, the question is whether the substance actually affected the person’s ability to drive safely.
Alcohol DUI Cases: How Impairment Is Evaluated
Alcohol DUI cases are often evaluated differently from drug DUI cases because alcohol has a commonly used measurement system: blood alcohol concentration (BAC).
For most adult drivers, a BAC of 0.08% or higher can support a DUI charge. However, California law does not limit DUI charges only to drivers who reach that number. A person may still face allegations of driving under the influence if their ability to drive was impaired, even if their BAC was below 0.08%.
Evidence in an alcohol DUI investigation may include:
- Breath test results
- Blood test results
- Field sobriety test performance
- Driving behavior
- Officer observations
- Statements made during the investigation
For example, a driver who is stopped after drifting across lanes, displaying signs of impairment, and later provides a BAC result above the legal limit may face a DUI investigation based on multiple forms of evidence.
Drug DUI Cases: Why They Can Be More Complicated
Drug-related DUI cases often involve more complex questions because California does not have a universal drug impairment measurement comparable to the BAC standard used for alcohol.
Unlike alcohol, there is generally no single drug concentration level that automatically establishes impairment for most DUI cases involving substances such as cannabis or prescription medications.
A chemical test may show that a substance is present in a person’s body, but the presence of a drug alone does not always explain:
- When the substance was consumed
- Whether the substance was affecting the person at the time of driving
- How strongly the substance affected driving ability
Because of this, drug DUI investigations often consider several types of evidence together.
This may include:
- Blood testing
- Officer observations
- Field sobriety testing
- Drug recognition evaluations
- Statements from the driver
- Expert analysis
Can Prescription Medication Lead to a DUI Charge in California?
Yes. A person can potentially face a DUI charge involving prescription medication if law enforcement alleges that the medication impaired their ability to drive safely.
Many people assume that a legally prescribed medication cannot result in DUI charges. However, prescription drugs may still affect driving ability, especially if they cause side effects such as:
- Drowsiness
- Delayed reaction time
- Confusion
- Dizziness
- Reduced coordination
Examples of medications that may affect driving include certain:
- Pain medications
- Sleep medications
- Anti-anxiety medications
- Muscle relaxants
The fact that a medication was prescribed does not automatically determine whether someone was impaired. Investigators may consider the medication’s effects, the circumstances of driving, and other available evidence.
Can Marijuana Result in a DUI in California?
Yes. Although recreational marijuana use is legal for adults in California, driving while impaired by marijuana remains illegal.
A person may face a marijuana DUI allegation if law enforcement believes cannabis affected their ability to safely operate a vehicle.
Marijuana DUI cases can involve unique challenges because THC does not work the same way as alcohol. California does not use a BAC-style THC limit that automatically establishes impairment in most DUI cases.
A positive marijuana test may show that cannabis was consumed, but it does not necessarily answer every question about impairment at the time of driving.
Investigators may also consider:
- Driving behavior
- Physical signs observed by officers
- Coordination and attention tests
- Statements made during the stop
- Chemical test results
THC may remain detectable in the body after the effects of impairment have decreased, which is why marijuana DUI cases often involve evidence beyond a chemical test result.
How Are Drug DUI Cases Investigated?
Drug DUI investigations may involve several different methods of evaluating possible impairment.
Field Sobriety Tests
Field sobriety tests are commonly used during DUI investigations. These tests generally evaluate areas such as:
- Balance
- Coordination
- Attention
- Ability to follow instructions
However, performance on these tests can be affected by many factors, including:
- Medical conditions
- Fatigue
- Stress
- Injuries
- Environmental conditions
Field sobriety tests were primarily developed for alcohol impairment investigations and may have limitations when evaluating certain types of drug impairment.
Drug Recognition Evaluations
In some cases, specially trained officers may perform a Drug Recognition Evaluation (DRE).
A DRE involves multiple observations and assessments intended to evaluate whether a person may be under the influence of certain categories of drugs.
A DRE opinion is one piece of evidence in a DUI investigation. Like other evidence, it may be considered along with chemical testing, driving behavior, and other circumstances.
Chemical Testing
Blood testing is commonly used in drug-related DUI investigations because it can identify certain substances and their concentrations.
However, interpreting drug test results can be complicated. A test result may provide information about the presence of a substance, but additional evidence may be needed to understand whether that substance affected driving ability at the relevant time.
Is a Drug DUI Worse Than an Alcohol DUI?
A common question is whether a drug DUI is treated more seriously than an alcohol DUI.
The answer depends on the circumstances of the individual case. California DUI consequences may be affected by factors such as:
- Prior DUI history
- Whether an accident occurred
- Whether anyone was injured
- The facts surrounding the traffic stop
- The type of substance involved
- Other legal circumstances
A drug DUI is not automatically more serious than an alcohol DUI. California generally evaluates DUI cases based on the specific facts and evidence involved rather than simply the type of substance alleged.
Can You Get a DUI for Combining Alcohol and Drugs?
Yes. California DUI cases may involve allegations that a person was impaired by a combination of alcohol and drugs.
Combining substances may create additional concerns because different substances can interact and affect:
- Alertness
- Coordination
- Reaction time
- Judgment
For example, a person who consumes alcohol while taking a medication that causes drowsiness may experience greater impairment than from either substance alone.
Evidence in these cases may include:
- Alcohol testing results
- Drug testing results
- Officer observations
- Statements from witnesses or the driver
Common Questions About Drugged and Drunk Driving DUI Cases
Does a positive drug test automatically mean someone is guilty of DUI?
No. A positive drug test alone does not automatically establish every element required for a DUI conviction. The overall evidence regarding impairment and driving ability may be considered.
Can someone be charged with DUI without a breath test?
Yes. DUI investigations may involve different types of evidence. A breath test is only one possible piece of evidence, particularly in alcohol-related cases.
How long do drugs stay detectable in the body?
Detection times vary depending on factors such as:
- The substance involved
- The amount consumed
- Frequency of use
- Individual metabolism
- Testing method
A detectable substance does not necessarily establish exactly when it was consumed or whether someone was impaired while driving.
Can you get a DUI for taking medication exactly as prescribed?
Yes, if the medication allegedly affected the person’s ability to drive safely. A prescription does not automatically prevent a DUI investigation.
Is drug DUI treated differently from alcohol DUI in California?
Yes. While both involve allegations of impaired driving, alcohol cases often rely heavily on BAC evidence, while drug DUI cases typically require a broader evaluation of impairment evidence.
Why Understanding the Difference Between Drug and Alcohol DUI Matters
Although both alcohol DUI and drug DUI cases involve allegations of impaired driving, the evidence used to evaluate each type of case can be very different.
Alcohol DUI cases often focus on BAC measurements and related observations. Drug DUI cases may involve additional questions about the substance involved, the timing of consumption, and whether the substance affected the driver at the time of operation.
Because every DUI case depends on its own facts, understanding the general legal framework can help people better understand the issues involved.
Conclusion
Drugged driving and drunk driving cases both involve allegations that a person operated a vehicle while impaired, but the way those cases are investigated and evaluated can differ significantly.
Alcohol cases often rely on BAC testing and observations related to alcohol impairment. Drug cases may require a broader review of chemical testing, driving behavior, officer observations, and other evidence related to impairment.
Contact Southwest Legal
If you have questions about a DUI involving alcohol, prescription medication, cannabis, or other substances, Southwest Legal can provide information and guidance to help you better understand the legal issues involved and the next steps you may want to consider.
Contact us today for a free consultation to discuss your situation with an experienced DUI defense attorney and learn about your legal options.
isclaimer: This article is for general informational purposes only and does not constitute legal advice or create an attorney-client relationship. No attorney-client relationship is formed unless and until the firm and client enter into an agreement for legal services. Laws may change, and legal outcomes depend on the specific facts of each case. Consult a qualified attorney for advice regarding your situation.