DWI Blood Test

After an arrest for driving while intoxicated (DWI) or driving under the influence (DUI) of alcohol or drugs in Texas, the driver might be required by law to submit to chemical blood testing by force, even if the driver initially refuses.

Although a person is typically not required to submit to blood alcohol concentration (BAC) testing in Texas under section 724.013 of the Texas Transportation Code, there are certain situations where the suspected DWI offender will be required to have their blood drawn to test for alcohol concentration levels.

Even if you were not required to have your blood drawn, but submitted to the chemical testing and failed the test, you will not necessarily be convicted of the DWI charges you are facing. Several factors influence the outcome in a DWI case involving a blood test.

If you refused the blood test and were not required to have you blood drawn, but were subsequently charged with a DWI offense, you might still avoid a conviction. The prosecution is required to show beyond a reasonable doubt that your BAC was .08 or higher or your normal mental or physical abilities were impaired from the use of alcohol or drugs. This is a very high burden to meet without concrete evidence of alcohol concentration levels from a blood test.

DWI Blood Test Lawyer in Dallas, TX

If you refused to submit to a chemical blood test for DWI in Dallas, or any of the surrounding areas in Texas, including Garland, Irving, Grand Prairie, Denton, Plano, McKinney, Fort Worth, Arlington, Mesquite, Carrolton,Decatur, Terrell, Weatherford, Sherman, Rockwall, Burleson, Waxahachie, Richardson, Lewisville, or Frisco, contact Law Offices of Richard C. McConathy.

Attorney Richard McConathy is knowledgeable in all areas of chemical testing for DWI in Texas and will make every effort to fight the admission of any blood test evidence at trial. Contact Law Offices of Richard C. McConathy about your chemical blood test for suspected DWI. Call (972) 233-5700.

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Texas’ Implied Consent Rule

Texas has an implied consent rule, under Tex. Transp. Code Ann. § 724.011, where anyone who is arrested for any driving while intoxicated offense, including intoxication assault and intoxication manslaughter, is deemed to have given consent to have their blood or breath chemically tested in order to determine their alcohol concentration level or if there are controlled substances or drugs in their blood.

According to Tex. Transp. Code Ann. § 724.013, however, law enforcement officers are not permitted to take a blood sample from individuals who are arrested for DWI and refused to submit to chemical testing except in certain specified situations. If a person does refuse to submit, they will automatically face an administrative license suspension.

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Mandatory Warrantless Blood Tests in Dallas

According to Tex. Transp. Code Ann. § 724.012, police officers are required to draw an individual’s blood who has been arrested for DWI or boating while under the influence of alcohol if the individual refused to submit to testing and:

  • The individual was the driver of a vehicle involved in an accident and the arresting officer reasonably believes an individual will die or has died from the accident, or an individual, other than the driver, suffered serious bodily injury from the accident or suffered bodily injury and was taken to a medical facility for treatment;
  • The driver who is suspected of DWI had a child passenger under the age of 15 in the vehicle;
  • The arresting officer has reason to believe the alleged offender has previously been convicted of, or placed on community supervision, for DWI with a child passenger under the age of 15, intoxication assault or intoxication manslaughter; or  
  • The arresting officer has reason to believe the alleged offender has previously been convicted of, or placed on community supervision, for two or more previous DWI offenses.

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Chemical Blood Testing in Texas

Under Tex. Transp. Code Ann. § 724.017, certain procedures are required to be followed when the alleged DWI offender is given a chemical blood test to determine alcohol concentration. These requirements include:

  • The sample must be taken in a sanitary place, and
  • Only physicians, qualified technicians, chemists, registered professional nurses or licenses vocational nurses may take a blood sample.

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Drug DWI Blood Testing in Texas

If an individual who is suspected of DWI submits to a breath test, but blows under the legal limit of .08, or there is no evidence of alcohol impairment, the law enforcement officer will probably request the alleged offender submit to a chemical blood test to test for evidence of drugs or controlled substances. The blood sample will be tested for a variety of controlled substances, including, but not limited to:

  • Marijuana
  • Cocaine
  • Heroin
  • Narcotics
  • Methamphetamines
  • Opiates
  • Medication with or without a prescription

The problem with testing for drugs or controlled substances in the blood after suspicion of DWI is that blood tests do not accurately show when the alleged offender was under the influence of the drugs or substances. Although the tests are usually reliable in showing drugs or drug metabolites in the blood, the substances may have stayed in the alleged offender’s system long after the individual was no longer under their influence and capable of safe driving.

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Suppressing Blood Test Evidence in Dallas, TX

Chemical blood tests are typically considered to be more reliable and accurate than breath testing in Texas, but chemical blood tests usually have more stringent requirements to follow when being administered, so the results can be easier to fight at trial. Some of the following examples may give reason to exclude or suppress blood test evidence at trial:

  • The blood test was given by a person not qualified to do so,
  • The blood test was not taken in a sanitary place,
  • The person administering the blood test was negligent in doing so,
  • The blood sample was contaminated from foreign substances or from many people handling the sample,
  • The arresting officer stopped the alleged DWI driver without probable cause,
  • The arresting officer gave a warrantless blood test after the alleged offender refused, but the officer was not permitted to do so because no exceptions applied, or
  • The arresting officer failed to give the alleged offender Miranda Warnings after they were arrested.

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Dallas Administrative License Suspension for DWI Blood Tests

If an individual has been arrested for DWI in Dallas and they refused to submit to chemical testing of their blood to determine their alcohol concentration level, their license will be administratively suspended or revoked. Even if the individual is not subsequently arrested for DWI, their license will still be suspended, which is a civil penalty. For a first DWI offense, the period is usually 180 days. If the individual has two or more previous DWI contacts, the suspension is typically for two years.

If the alleged DWI offender did submit to chemical testing of their blood, but failed the intoxication test with an alcohol concentration level over the legal limit, they could still receive an administrative license suspension, even if they are not subsequently charged with a DWI offense. The legal limit for adults is .08, and juvenile offenders can receive an administrative license suspension if they have any detectable amount of alcohol in their blood.

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Finding an Attorney for DUI Blood Testing in Dallas / Ft. Worth, TX

Contact Law Offices of Richard C. McConathy today for a consultation about refusing to submit or submitting to a chemical blood test in Dallas County in Texas. Richard McConathy is an experienced Dallas attorney for DWI who will make every to fight the DWI allegations against you.

Call (972) 233-5700 right now for a consultation about your DWI blood test in Dallas County in Texas and the surrounding counties of Wise County, Kaufman County, Parker County, Grayson County, Rockwall County, Johnson County, Ellis County, Denton County, Collin County, and Tarrant County.

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This article was last updated on Friday, November 9, 2018.

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