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Breath and Blood Tests in Dallas DWI Cases

Breath tests and blood tests are different types of evidence in a DWI case, and both can be challenged. A breath test estimates alcohol concentration by analyzing a person's breath, while a blood test measures alcohol and, depending on the testing performed, other substances in a blood sample.

A chemical test result is only one part of the evidence prosecutors may use in a Dallas DWI case. The State may also rely on the circumstances of the traffic stop, an officer's observations, field sobriety testing, body-camera footage, dashcam video, and statements made before or after an arrest.

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