Common Defences Against DUI Charges

Table Of Contents

DUI Defence: Challenging Probable Cause

Challenging probable cause for a stop is a fundamental defence strategy in DUI charges. The police officer needs a valid reason to stop a vehicle. A traffic violation often provides a valid reason for a stop. An observable sign of impairment also provides a valid reason for a stop. Without probable cause, the stop is unlawful. Evidence collected after an unlawful stop is inadmissible in court. The defence team scrutinises the initial police report. The defence team looks for discrepancies in the officer's account. The defence team interviews the arresting officer during discovery.
The defence team investigates the circumstances leading to the vehicle stop. The defence team reviews dashcam footage from the police vehicle. The defence team reviews body camera footage from the arresting officer. These recordings show the driver's actions before the stop. These recordings also show the officer's observations before the stop. The defence team establishes if the officer's stated reason for the stop matches the video evidence. A successful challenge to probable cause leads to the dismissal of the DUI charges.

What are Common DUI Defence Police Errors?

Common DUI defence police errors involve procedural missteps or misinterpretations of evidence. Police officers follow strict protocols during a DUI investigation. A police officer administers field sobriety tests correctly. A police officer calibrates breathalyser equipment regularly. A police officer observes the suspect for a specific period before a breath test. Any deviation from these procedures creates grounds for a defence. The defence highlights these errors to challenge the arrest validity.
The defence team meticulously reviews all police documentation. The defence team checks for missing reports or incomplete forms. The defence team verifies the proper handling of evidence. The defence team makes sure the chain of custody for all samples is intact. A police officer's failure to read the Miranda rights at the appropriate time also constitutes a common error. These errors undermine the prosecution's case. These errors increase the likelihood of a favourable outcome for the accused.

Are DUI Field Sobriety Tests a Common Defence?

Field sobriety tests are not always reliable indicators of impairment. Field sobriety tests are subjective assessments of a driver's physical and mental faculties. Factors other than alcohol influence a person's performance on field sobriety tests. Medical conditions influence field sobriety test performance. Fatigue influences field sobriety test performance. Certain medications influence field sobriety test performance. Poor coordination also influences field sobriety test performance. The officer's administration of the tests also influences the results. The testing environment also influences the results.
The defence team examines the conditions under which field sobriety tests were administered. The defence team considers the road surface. The defence team considers the weather conditions. The defence team considers the presence of distracting lights or noises. The defence team questions the officer's training and experience in administering these tests. The defence team argues that the field sobriety test results do not accurately reflect impairment. The defence team presents expert testimony about the limitations of field sobriety tests.

How to Challenge DUI Breathalyser Results Defences?

Challenging breathalyser results works by questioning the accuracy and calibration of the breath-testing device. Breathalyser machines require regular maintenance and calibration to provide accurate readings. The defence team requests maintenance logs for the specific breathalyser used. The defence team checks for any records of recent repairs or malfunctions. The defence team also investigates the qualifications of the technician performing the calibration. An improperly calibrated machine produces unreliable results.
The defence team also investigates external factors affecting breathalyser accuracy. Certain medical conditions, like GERD or diabetes, improve mouth alcohol levels. Improved mouth alcohol levels lead to falsely high readings. Residual mouth alcohol from recent drinking or mouthwash also skews results. This observation period makes sure no foreign substances interfere with the reading. A failure to observe this protocol invalidates the breathalyser result.

Can a Medical Condition Affect DUI Charges?

A medical condition can affect DUI charges by providing an alternative explanation for observed symptoms of impairment. Numerous medical conditions mimic the signs of alcohol intoxication. Diabetes, for example, causes disorientation and slurred speech during hypoglycaemic episodes. Epilepsy can cause seizures that appear like impairment. Inner ear disorders affect balance and coordination. Certain prescription medications also cause drowsiness, dizziness, or impaired motor skills. These conditions do not involve alcohol consumption.
The defence team gathers medical records to substantiate a medical condition defence. The defence team obtains expert testimony from medical professionals. The medical professionals explain how the condition affects the accused. The medical professionals describe how the condition explains the observed symptoms. This defence demonstrates that the accused was not under the influence of alcohol. This defence shifts the focus from intoxication to a legitimate medical explanation.

What are the Legal Defences for DUI?

Legal defences for DUI encompass a range of strategies aimed at challenging the prosecution's evidence or procedures. One legal defence challenges the legality of the initial traffic stop. Another legal defence questions the administration of field sobriety tests. A further legal defence disputes the accuracy of chemical test results, such as breath or blood tests. These defences focus on the procedural aspects of the arrest and evidence collection.
Other legal defences involve asserting constitutional rights violations. The police officer must inform the accused of Miranda rights at the appropriate time. The police officer must obtain consent before certain searches. A violation of these rights leads to the suppression of evidence. The defence team also examines the chain of custody for blood or urine samples. Any break in the chain of custody compromises the integrity of the evidence.

FAQS

What is the primary goal of a DUI defence?

The primary goal of a DUI defence is to challenge the prosecution's evidence. The primary goal is to protect the accused's rights. The primary goal is to achieve the best possible outcome for the client.

How do police officers establish probable cause for a DUI stop?

Police officers establish probable cause for a DUI stop through observable traffic violations. Police officers also establish probable cause through erratic driving behaviour. A police officer's observation of physical signs of impairment also establishes probable cause.

Can diet affect breathalyser readings?

Diet can affect breathalyser readings indirectly. A ketogenic diet, for example, produces acetone in the breath. Some older breathalyser devices misinterpret acetone as alcohol. This misinterpretation leads to falsely improved readings.

Is it always necessary to take a breathalyser test?

It is not always necessary to take a breathalyser test at the roadside. Refusing a breathalyser test carries consequences. A breathalyser test refusal often results in an immediate licence suspension. The police might require a blood test later.

What evidence does a DUI defence lawyer typically review?

A DUI defence lawyer typically reviews police reports. A DUI defence lawyer reviews dashcam footage. A DUI defence lawyer reviews body camera footage. A DUI defence lawyer reviews breathalyser maintenance records. A DUI defence lawyer reviews medical records.

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