Texas prosecutors can use physical evidence, witness testimony, your own statements, digital records, and surveillance footage to build a case against you. What they cannot use is evidence obtained in violation of the U.S. Constitution or Texas law. Understanding the difference, and challenging unlawful evidence early, can be the most consequential decision in your defense.
The Standard Prosecutors Must Meet
Every criminal prosecution in Texas requires the government to prove guilt beyond a reasonable doubt. That standard, rooted in the Due Process Clause of the Fourteenth Amendment, demands that the jury have no reasonable alternative conclusion other than that the defendant committed the offense charged. It is the highest evidentiary burden in the American legal system, and the prosecution must meet it entirely through admissible evidence.
Evidence in a Texas criminal case is governed by the Texas Rules of Evidence and the Texas Code of Criminal Procedure. Together, these frameworks define what types of evidence may be admitted at trial and under what conditions. Violations of either set of rules, or of constitutional protections, can result in the exclusion of evidence that the prosecution was counting on.
The Five Categories of Evidence Prosecutors Rely On
Texas prosecutors typically build their cases from one or more of the following categories. Each type carries different strengths and vulnerabilities that a skilled defense attorney will examine closely.
Physical Evidence. Tangible objects seized from the scene of an alleged crime, a vehicle, or a home are among the most powerful forms of evidence. Weapons, drugs, clothing, fingerprints, and DNA samples fall into this category. For physical evidence to be admitted, the prosecution must establish an unbroken chain of custody showing that the item was collected, stored, and transferred without contamination or tampering. A break in that chain is grounds for exclusion.
Testimonial Evidence. Testimony from eyewitnesses, law enforcement officers, victims, and expert witnesses makes up the bulk of most criminal trials. Eyewitness accounts are powerful but notoriously unreliable. Research published by the Innocence Project shows that mistaken eyewitness identification has contributed to more wrongful convictions than any other single factor. Cross-examination is the primary tool for exposing weaknesses in testimonial evidence.
Documentary Evidence. Written records, photographs, medical reports, financial records, and police reports are all documentary evidence. Like any other form of evidence, documents must be authenticated before they are admitted, meaning the prosecution must demonstrate that the document is what it purports to be and has not been altered.
Statements Made by the Defendant. What a person says to law enforcement can become one of the most damaging categories of evidence against them. Under the Fifth Amendment, no person is required to incriminate themselves. The Supreme Court’s decision in Miranda v. Arizona, 384 U.S. 436 (1966), established that any statement obtained during a custodial interrogation conducted without Miranda warnings must be suppressed. In Texas, even voluntary statements made before arrest can be used at trial if Miranda protections did not yet apply.
Digital and Electronic Evidence. Cell phone records, GPS location data, text messages, emails, surveillance footage, and social media activity have become standard components of Texas criminal prosecutions. According to studies cited by law enforcement agencies, digital evidence now plays a central role in the majority of criminal investigations. Prosecutors use location data to place a defendant near a crime scene, social media posts to establish intent or motive, and communication records to show planning or coordination.
Your Social Media Activity Is Likely Already Being Reviewed
Many people assume that private or restricted social media accounts are beyond a prosecutor’s reach. They are not. Law enforcement can obtain a search warrant to access restricted content, private messages, photos, and account metadata from any major platform. Posts, likes, shares, check-ins, and even the embedded location data in uploaded photos can be used to establish a timeline, contradict an alibi, or suggest consciousness of guilt.
A Critical Reminder
Once you are under investigation or have been arrested, anything you post online can be obtained by prosecutors and introduced at trial. This includes posts you later delete. Courts have repeatedly held that deleting evidence after becoming aware of an investigation can itself be treated as evidence of consciousness of guilt.
When Evidence Cannot Be Used Against You: The Exclusionary Rule
Not all evidence that law enforcement collects is admissible. The Fourth Amendment to the U.S. Constitution prohibits unreasonable searches and seizures, and evidence obtained in violation of that protection is subject to exclusion under the exclusionary rule.
Texas provides even broader protection than federal law. Under Texas Code of Criminal Procedure Article 38.23, any evidence obtained by an officer or any other person in violation of any provision of the Texas Constitution, the U.S. Constitution, or any applicable law must be excluded from trial. This is sometimes called the Texas exclusionary rule, and it is broader in scope than the federal standard because it applies to violations of any law, not just constitutional provisions.
Common grounds for suppression in Texas criminal cases include searches conducted without a valid warrant and without a recognized exception, traffic stops unsupported by reasonable suspicion, coerced confessions, and failure to administer Miranda warnings before a custodial interrogation. When a motion to suppress is granted, the excluded evidence cannot be used by the prosecution at trial, which can fundamentally alter the strength of the government’s case.
Why Challenging Evidence Early Is Essential
The window to challenge improperly obtained evidence is narrow. Motions to suppress must generally be filed before trial, and failing to raise suppression arguments at the right time can waive those rights permanently. This is one of the most important reasons why retaining experienced criminal defense counsel promptly after an arrest can determine the outcome of an entire case.
A defense attorney’s pretrial investigation reviews how and when evidence was gathered, whether warrants were properly obtained and executed, whether chain of custody was maintained, and whether any statements were taken in violation of constitutional rights. Evidence that appears overwhelming at first glance often looks very different after a thorough examination of how it was collected.
Facing Criminal Charges in The Woodlands? Morgan Bourque Can Help.
At Morgan Bourque Attorney at Law, we represent clients facing state and federal criminal charges throughout The Woodlands and Montgomery County. We scrutinize every piece of evidence the prosecution intends to use, identify suppression issues, and build the strongest possible defense from the earliest stages of a case.
The decisions made in the first hours and days after an arrest shape everything that follows. Contact our office or call (713) 766-6001 today. We are always available and ready to stand in your corner.
Disclaimer: This article is for informational purposes only and does not constitute legal advice. For legal guidance tailored to your specific situation, consult a licensed attorney.