YOU DESERVE A STRONG DEFENSE. CALL ME TODAY
Handcuffed man in dark background

Understanding Intoxication Manslaughter Evidence Requirements

The Law Office of Justin K. Hall P.C. June 13, 2025

When facing an intoxication manslaughter charge in Texas, understanding the evidence requirements is crucial. As a DWI defense attorney, I've seen firsthand how challenging these cases can be for those involved. 

The legal system often relies on complex evidence to build a case, but as your attorney, my job is to make sure the prosecution proves its case beyond a reasonable doubt. Serving Rockwall, Dallas, Collin, Hunt, and Kaufman, The Law Office of Justin K. Hall P.C. can help you.

What Is Intoxication Manslaughter?

In Texas, intoxication manslaughter occurs when someone is killed as a result of another person’s impaired driving. If the driver is intoxicated by alcohol, drugs, or a combination of both, and they cause the death of another person, they can be charged with intoxication manslaughter.

It’s a serious offense that can lead to severe penalties, including long prison sentences and hefty fines. Unlike regular manslaughter, intoxication manslaughter specifically deals with the element of intoxication. 

This makes it a particularly difficult charge for defendants, as the prosecution often has an easier time presenting evidence of intoxication than other forms of manslaughter. As a DWI defense attorney, one of the first things I look for in these cases is how the prosecution plans to establish intoxication.

Key Elements of Intoxication Manslaughter Evidence

There are three core elements the prosecution must prove to obtain a conviction for intoxication manslaughter:

  • The Defendant Was Intoxicated

  • The Defendant’s Intoxication Led to a Fatal Accident

  • The Defendant’s Actions Were the Direct Cause of the Victim's Death

Each of these elements has specific evidence requirements, and it’s up to your DWI defense attorney to challenge these elements and look for weaknesses in the case. Let’s dive deeper into each element.

1. Proving Intoxication

The first thing the prosecution must prove is that the defendant was intoxicated at the time of the accident. Intoxication in Texas law can refer to either alcohol or drugs, and both types of intoxication can be proven in several ways:

  • Blood Alcohol Concentration (BAC): One of the most common ways intoxication is proven is through BAC testing. If you were pulled over and tested at the scene, your BAC might be used as evidence.

  • Field Sobriety Tests: If you were subjected to field sobriety tests (FSTs) at the scene, these results could also be used as evidence. However, FSTs are subjective and can be influenced by many factors, such as the environment, your physical condition, or how nervous you were.

  • Drug Testing: If drugs were involved, urine or blood tests may be used to show intoxication. It’s important to note that drug impairment is harder to measure than alcohol, which is why there’s more room for challenge in these cases.

One of the most important things I do as a DWI defense attorney is to examine how the tests were administered. Errors in the testing procedure or improper handling of evidence can be grounds for dismissing key evidence in your case.

2. Establishing the Fatal Accident

The second element the prosecution must prove is that the accident that led to the victim's death was fatal. This might seem straightforward, but proving that the accident was the direct cause of death can be more difficult than it seems.

  • Accident Reports: Police reports and eyewitness testimony often serve as primary evidence in establishing that an accident occurred. These reports document the location, time, and circumstances of the crash, along with any observations the officer may have made at the scene.

  • Autopsy Reports: When a fatality occurs, an autopsy is often performed to determine the cause of death. Autopsy reports can indicate whether the fatality resulted from blunt force trauma, a head injury, or other causes, which is vital for showing the link between the defendant’s actions and the victim’s death.

  • Accident Reconstruction: In some cases, accident reconstruction experts may be called to testify about the cause of the crash. This expert testimony can help establish how the accident occurred and whether the defendant's actions caused the fatality.

If there’s any doubt about the direct connection between the accident and the victim’s death, my role as your DWI defense attorney is to highlight those uncertainties. Sometimes, the link between the accident and the death isn’t as clear-cut as the prosecution might suggest.

3. Causation: The Defendant’s Actions Were the Direct Cause of Death

Even if the defendant was intoxicated and a fatal accident occurred, the prosecution must prove that the defendant’s actions directly caused the death. This is often the most difficult part of the case for the prosecution.

  • Causation Issues: Sometimes, there are external factors that can cause an accident. For instance, another driver could have been involved, or environmental conditions like wet roads or poor visibility could have played a role in the crash. If any other factors contributed to the accident, it can be difficult to prove that intoxication was the sole cause of the fatality.

  • Witness Testimony: Eyewitnesses to the accident can provide valuable insight into how the crash occurred. If witnesses testify that the defendant wasn’t driving erratically or failing to control the vehicle, it may cast doubt on the claim that intoxication was the cause of the accident.

  • Prior DUI History or History of Reckless Driving: In some cases, the prosecution may use the defendant’s prior history of reckless driving or DUIs to show a pattern of dangerous behavior. However, the presence of a prior history doesn’t automatically make someone guilty of intoxication manslaughter.

Challenges to Intoxication Manslaughter Evidence

There are several ways a DWI defense attorney can challenge the evidence in an intoxication manslaughter case. Let’s go over some of the most common defenses I use:

Challenging BAC Results

BAC testing is one of the most common pieces of evidence in intoxication manslaughter cases, but it’s not foolproof. There are several ways to challenge BAC results:

  • Improper Testing Procedures: If the BAC test was administered incorrectly or if the officer didn’t follow proper protocols, the results may be inadmissible in court.

  • Rising Blood Alcohol Levels: Alcohol levels can rise over time, which means that by the time a test is administered, a driver’s BAC could be higher than it was at the time of the accident.

  • Medical Conditions: Certain medical conditions, such as diabetes or acid reflux, can affect BAC readings. If you have any of these conditions, they could be the reason for a false high BAC result.

Challenging Field Sobriety Test Results

Field sobriety tests are subjective and can easily be influenced by external factors. A police officer may believe that you failed a sobriety test, but there’s no clear-cut way to determine how much intoxication played a role in the results. 

Challenging Eyewitness Testimony

Eyewitness testimony can be unreliable. People can misremember details, and biases can cloud their perceptions. If I can show that an eyewitness’s account of the accident is inconsistent with other evidence or is inherently unreliable, it can cast doubt on the prosecution’s case.

Proving No Direct Causation

Finally, if there’s any reasonable doubt that the defendant’s actions directly caused the victim’s death, it’s crucial for your DWI defense attorney to raise these issues. Perhaps there was another vehicle involved, or maybe the victim’s actions contributed to the accident. If any doubt remains, a conviction shouldn’t be allowed.

Why You Need a Skilled DWI Defense Attorney

If you're facing an intoxication manslaughter charge, you need a DWI defense attorney who is experienced in handling these complex and serious cases. A skilled attorney can investigate the evidence, challenge the prosecution’s claims, and help you understand your options.

As your DWI defense attorney, my goal is to provide you with the best defense possible. I’ll work tirelessly to protect your rights and make sure that you get a fair trial. Intoxication manslaughter cases are serious, but with the right legal representation, you can fight back.

Contact Us Today

Intoxication manslaughter cases are incredibly serious, and the evidence required to prove them is both challenging and intricate. As your DWI defense attorney serving Rockwall, Dallas, Collin, Hunt, and Kaufman, Texas, my role is to assess the evidence thoroughly, look for weaknesses in the prosecution's case, and provide you with a strong defense. If you or someone you know is facing an intoxication manslaughter charge, call The Law Office of Justin K. Hall P.C.