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  5. 5 common DUI defenses in Pennsylvania

5 common DUI defenses in Pennsylvania

On Behalf of Thompson Law | Nov 11, 2025 | DUI

A DUI arrest in Lackawanna County can be frightening and confusing. You may feel all hope is lost, but facing a DUI charge does not mean you are automatically guilty. Serious charges like these must meet a high legal standard, and many who fight them see their charges dropped or penalties reduced. Knowing possible defense strategies is the first step; here are some common ones used in Pennsylvania DUI cases.

1. Police had no valid reason to stop you

An officer must have a legitimate reason to pull your vehicle over, called “reasonable suspicion,” which is a lower standard than probable cause. If the initial traffic stop was made without reasonable suspicion of a traffic violation (e.g., speeding) or criminal activity, the stop may violate your rights and lead to the suppression of evidence.

2. Improper field sobriety testing

The field sobriety tests (FSTs) given at the roadside are not perfect. In fact, they are subjective and often administered incorrectly. Your attorney will question whether environmental factors like weather, poor road conditions or even ill-fitting shoes affected your performance.

If the officer failed to follow the standardized testing procedure for the walk-and-turn or one-leg stand tests, your attorney may argue to suppress the results as unreliable or inadmissible evidence. Furthermore, the horizontal gaze nystagmus test is generally inadmissible in Pennsylvania courts.

3. Challenging blood test accuracy

Problems may include improper breathalyzer calibration, operator error or a faulty testing device. Crucially, an unexplained break in the chain of custody for blood samples can lead to the BAC reading being suppressed and deemed inadmissible in court.

4. Rising blood alcohol

A delay often happens between the time you stop driving and the time of the chemical test. Because your body continues to absorb alcohol, your attorney can argue a ‘rising blood alcohol’ defense, arguing that your BAC was below the .08 legal limit within two hours of driving, but increased above the limit later. This defense often requires expert testimony.

5. Police procedure violations

Police must follow proper procedures and respect your constitutional rights during an arrest. If the officer failed to read you your Miranda rights before questioning you while in custody, any incriminating statements may be excluded. An unreasonable delay in administering the chemical test is a separate violation that can result in the suppression of BAC evidence.

Understand your legal options

Fighting a DUI in Lackawanna County requires a detailed investigation of all the facts. Attorneys build strong defenses by scrutinizing police evidence and testing protocols. Your lawyer can explore every angle of your arrest and the evidence collected. Because DUI law is complex, and penalties often cause long-lasting consequences, having skilled, experienced legal representation is crucial.

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