When someone is arrested for DWI in Longview, prosecutors often rely on multiple forms of evidence to try to prove intoxication. Many drivers assume a DWI case depends entirely on a breath test result, but Texas law enforcement officers frequently build cases using observations, video recordings, chemical tests, and witness statements.

Understanding the types of evidence commonly used in DWI investigations can help drivers better understand how prosecutors attempt to secure convictions.

Police officers often begin gathering evidence the moment they observe a vehicle. Officers may claim the driver was:
• Swerving between lanes
• Speeding
• Driving too slowly
• Failing to signal
• Running stop signs
• Making unusually wide turns

After initiating the traffic stop, officers usually continue documenting observations that they believe indicate intoxication. These may include alleged slurred speech, bloodshot eyes, confusion, fumbling movements, or the odor of alcohol.

Field sobriety testing frequently becomes another major component of the case. Officers may ask drivers to perform balancing and coordination exercises designed to evaluate physical and mental impairment. However, these tests are often subjective and influenced by outside factors unrelated to alcohol.

Medical conditions, fatigue, nervousness, uneven pavement, weather conditions, injuries, and age may all affect field sobriety test performance.

Police may also rely heavily on:
• Dash camera recordings
• Body camera footage
• Breath test results
• Blood test results
• Witness statements
• Admissions made by the driver
• Dispatch recordings

Chemical testing evidence is often treated as highly persuasive by prosecutors, but breath and blood tests are not always reliable. Breath testing machines require proper calibration and maintenance, while blood samples must be collected, stored, and analyzed correctly.

Errors involving contamination, improper storage, or laboratory procedures may affect blood test reliability. Certain medical conditions and medications may also influence chemical testing results.

Video footage can sometimes contradict written police reports. Officers may describe severe impairment in reports while recordings show a driver speaking clearly and following instructions appropriately. An experienced DWI defense attorney may carefully analyze all available footage for inconsistencies.

Statements made by drivers during roadside questioning can also become powerful evidence. Many people unknowingly admit to drinking or provide information prosecutors later use against them.

However, police officers must still comply with constitutional protections during every stage of the investigation. If officers lacked reasonable suspicion to stop the vehicle or probable cause to make the arrest, certain evidence may become subject to suppression.

An experienced Longview DWI defense attorney may investigate:
• Whether the stop was lawful
• Whether testing procedures followed legal standards
• Whether officers properly administered field sobriety tests
• Whether chemical evidence was reliable
• Whether constitutional rights were violated

Many DWI cases involve weaknesses that are not obvious immediately after arrest. Careful review of reports, video evidence, laboratory records, and officer conduct may reveal opportunities to challenge the prosecution’s case.

A DWI arrest does not automatically guarantee conviction. Protecting your rights early may significantly affect the outcome of your case and your future opportunities.

Call The Law Office of Alex Tyra, P.C. For Your Free Consultation

If you’ve been charged with DWI in Longview or anywhere in East Texas, don’t wait. The clock starts ticking the moment you’re arrested, and every decision you make from here on out matters. The Law Office of Alex Tyra, P.C. is ready to help you protect your future, your license, and your wallet.

Call us today at (903) 753-7499 to schedule your free consultation and take the first step toward fighting your DWI charges.