Question the Science Before It Reaches the Jury

Setra Law Firm, PC files expert challenges under Rule 702 and Daubert or Kelly standards for clients in Odessa and Midland, Texas, to exclude unreliable forensic or technical testimony in criminal cases.

Setra Law Firm, PC represents individuals whose cases involve search warrants that were obtained using affidavits containing false statements, material omissions, or reckless misrepresentations by law enforcement. You may have been charged after a search that was authorized by a warrant, but the officer who applied for that warrant may have left out key facts, misstated what a witness said, or included information the officer knew or should have known was false. This firm files motions for Franks hearings to challenge the validity of the warrant and seeks to suppress all evidence obtained as a result of the defective affidavit.


The process begins with a close review of the probable cause affidavit submitted to the judge, comparing it against police reports, witness statements, and other documentation to identify inconsistencies or omissions. Under Franks v. Delaware, you have the right to challenge a warrant if you can show that the affidavit contained a false statement made knowingly or with reckless disregard for the truth, and that the false statement was necessary to the finding of probable cause. If the court grants a Franks hearing, the officer who signed the affidavit must testify, and the warrant can be invalidated. In complex felony cases involving drugs, firearms, or financial crimes, a successful Franks motion can eliminate the prosecution's core evidence.



If your case involves a search warrant and you believe the affidavit contained false or misleading information, contact Setra Law Firm, PC to discuss whether a Franks hearing is appropriate.

How Expert Challenges Weaken the Prosecution's Theory

You receive a copy of the expert's report and curriculum vitae. The firm reviews the testing procedures, the chain of custody, the expert's qualifications, and the methodology used to form the opinion. If the testing was not conducted according to standard protocols, if the expert lacks training in the specific area being testified about, or if the conclusions are speculative, a motion is filed to exclude the testimony. The motion requests a pretrial hearing where the expert must testify and be cross-examined on the reliability of the methods used.


After the hearing, the court decides whether the testimony is admissible. If the motion is granted, the expert cannot testify, and the prosecution loses a key piece of evidence. Setra Law Firm, PC uses these challenges not only to exclude unreliable testimony but also to weaken the prosecution's narrative and create doubt about the technical evidence the state is relying on. Even when a motion is not fully granted, the hearing often exposes weaknesses that can be exploited during cross-examination at trial.



Expert challenges are used in drug cases with lab analysis, sexual assault cases with DNA evidence, white collar cases with forensic accounting, and cases involving digital evidence such as cell phone extractions or computer forensics. They are especially important when the expert's opinion is the primary link between you and the alleged offense.

Empty courtroom with wooden paneling, a judge's bench, and rows of seats, illuminated by sunlight.

Clients ask these questions when they are facing charges that depend heavily on forensic or technical evidence presented by the prosecution's expert witnesses.

Common Questions About Expert Testimony Challenges

It is a pretrial hearing where the defense challenges the admissibility of expert testimony. The expert must testify about the methods used, and the judge determines whether the testimony is reliable enough to be heard by the jury. Daubert applies in federal court, and Kelly applies in Texas state court.

What is a Daubert or Kelly hearing?

You review the lab's procedures, quality control records, chain of custody documentation, and the analyst's qualifications. If the lab did not follow proper protocols, if controls were not run, or if the analyst made unsupported conclusions, those issues are raised in a motion to exclude.

How do you challenge a lab report?

The prosecution cannot present that testimony or rely on it to prove its case. In many cases, this results in dismissal or a significantly reduced charge because the state cannot meet its burden of proof without the expert's opinion.

What happens if the expert is excluded?

Why are these challenges important in Midland and Odessa?

Many cases in West Texas involve drug charges with lab results or DWI cases with blood or breath analysis. The reliability of those results is not always properly documented, and challenging the science can expose flaws that lead to suppression or acquittal.

Overreaching conclusions, such as stating that a substance is definitely a controlled substance when the test is only presumptive, or claiming a match is certain when the methodology allows for error or contamination.

What is the most common flaw in forensic testimony?

Overview of Texas Misdemeanor Defense


If you are facing misdemeanor charges in Texas, this guide will help you understand your options and make informed choices about how to defend and resolve your case.


Defending against misdemeanor criminal charges in Texas means using different strategies, like arguing the facts of the case, pointing out problems in the way the case was handled, or suggesting other ways to punish someone instead of jail. Texas divides misdemeanors into three levels: Class A (the most serious, with up to one year in jail or a $4,000 fine), Class B (up to 180 days in jail or a $2,000 fine), and Class C (only a fine up to $500).[1] People charged with these crimes can claim certain defenses, like self-defense, protecting someone else, doing something necessary to prevent harm, or protecting property. For all these defenses, the person must have had a reasonable belief that what they did was needed.[2] Other defenses include making an honest mistake about the facts, but only if that mistake means they didn’t have the guilty mind required for the crime.[3] There are also defenses about how the case is handled, like arguing that the case was brought too late (usually after two years for Class A and B misdemeanors), that it’s in the wrong place, or in the wrong court.[4] People charged with misdemeanors can also try to work out a deal with the prosecutor, which might include special types of probation or programs. If they finish these successfully, their case might be dismissed and they could have their record sealed.[5]


Types of Misdemeanors and Punishments in Texas


Texas law uses three levels to sort misdemeanors, which are less serious crimes. Class A misdemeanors (most severe) are the most serious kind and can get you up to a year in jail, a fine up to $4,000, or both.[1] Class B misdemeanors (moderate severity) can get you up to 180 days in jail or a fine up to $2,000.[2] Class C misdemeanors (least severe) are the least serious and only come with a fine up to $500, with no jail time.[3]


If someone keeps breaking the law and gets convicted of certain Class C misdemeanors three times within two years, the punishment can be increased to up to 180 days in jail and a fine up to $2,000.[4] Also, if a misdemeanor is a hate crime, the punishment can be raised to the next higher level. For Class A misdemeanors in hate crime cases, there is a required minimum of 180 days in jail.[5]


Defenses That Excuse Your Actions


Texas law gives people certain excuses, or defenses, for their actions in misdemeanor cases. One of these is self-defense. The law says you can use force to protect yourself if you honestly and reasonably believe you need to protect yourself from someone else's illegal use of force.[1] This defense uses both a subjective and objective test: you must actually believe (subjective honesty) that you need to use force, and your belief must also be reasonable in the eyes of an average person (objective reasonableness). Whether your belief was reasonable is usually decided by the judge or jury.[2]


You can also use force to protect someone else if you reasonably believe they are in danger from another person’s illegal force, and you think you need to step in right away to protect them.[3] There are also rules that allow you to use force to protect your land or things you own if you think it’s immediately needed to stop someone from trespassing or messing with your property.[4] For example, if someone walks onto your driveway without permission and refuses to leave, you might have the right to use reasonable force to make them go away. This helps put the law into everyday situations that people might face.


Another defense is called “necessity.” This means you did something illegal because you honestly thought you had to act right away to stop something bad from happening, and stopping the harm was more important than following the law.[5] If you want to use this defense, you have to admit you broke the law, but then explain that it was necessary to avoid a bigger problem (requires acknowledging the conduct).[6]


Defenses Based on Your State of Mind


The “mistake of fact” defense means that if you honestly and reasonably believed something that made you act, and if your belief means you didn’t have the guilty mind needed for the crime, then you might not be guilty.[1] But this only works if your mistake is about something important to the case, and if your belief was honest and reasonable.[2] If what you thought was true, then what you did wouldn’t have been illegal.[3]


The “mistake of law” defense is harder to use. You have to show that you reasonably believed what you did was not a crime, and you relied on something official, like a written statement from a government agency or a court opinion saying it was okay.[4] There’s also a “duress” defense, which means you only did the crime because you were forced or threatened so strongly that most people would have given in.[5]


Defenses Based on Legal Procedures and Deadlines


There are rules about how long the government has to charge you with a crime. For Class A and B misdemeanors, the case must be started within two years of the crime. For Class C misdemeanors, it’s also two years. If too much time passes, the case can’t go forward.[6] But if the case is for assault against a family or household member, they have up to three years to start the case.[7]


When the Statute of Limitations Can Be Paused


Certain events can pause or “toll” the clock on these deadlines. For example, if charges are already in court, the timer can stop running until the case is resolved or dismissed, making the time limit longer than it might seem at first.[8] Also, when figuring out the time, you don’t include the day the crime happened or the day the charges were filed.[9] Pay close attention to these details, because even small differences in timing can make or break a misdemeanor case.


The government has to bring the case in the right county. If they file it in the wrong place, you can challenge that. If you win a venue objection, the case could be dismissed (often "without prejudice," meaning it can be refiled in the correct county) or transferred to the court that actually has the authority to hear the case. Preserving this objection early can give you real leverage, since cases filed in the wrong place may face re-filing delays or even be dropped completely. Also, sometimes a court isn’t allowed to hear certain types of cases, and you can challenge that, too.[10]


Plea Bargains, Probation, and Other Sentencing Options


One of the best deals people can get in misdemeanor cases is called deferred adjudication community supervision. This means the judge puts the case on hold and does not officially find you guilty. The judge can do this if it seems good for both you and the public.[1] In these cases, you can be on supervision for up to two years.[2]


If you finish deferred adjudication successfully and the judge never finds you guilty, your case will be dismissed and you will be let go.[3] For some misdemeanors, this means you can also ask the court to seal your criminal record so it’s not public.[4]


Another option is regular community supervision (sometimes called probation), which lets you avoid jail after you’re found guilty. This usually lasts up to two years, but the court can make it up to three years if needed.[5] Veterans on supervision for misdemeanors may get extra help through special job programs while they are on probation.[6]


How Texas Courts Apply These Defenses


Texas courts say that if you bring up a defense and there’s some evidence for it, the judge must explain that defense to the jury. For example, in a case called Spakes v. State, the court said that someone accused of escaping didn’t have to prove they tried to turn themselves in if they had evidence that they left because they needed to avoid immediate harm. If you show you had to leave right away to stop something bad from happening, you should get a “necessity” instruction for the jury.[7]


About the “mistake of fact” defense, the court in Beggs v. State said that if someone honestly made a mistake about something important to the case, they should get a jury instruction about this defense.[8]


Recent Changes in Texas Misdemeanor Law


In 2017, Texas updated its laws about probation and deferred adjudication. The new rules make it clearer who is eligible, give more protection to people in the system, and make it easier to get your record sealed if you qualify.[9]


There are special job programs for veterans who are on community supervision for misdemeanors, which give them more help and support while they’re on probation.[10]


Now, for assault charges involving family or household violence, the government has up to three years to bring the case. Lawmakers made this change because these cases are often complicated and may take more time to investigate and prosecute.[11]


Other Important Issues in Misdemeanor Cases


* You can ask the court to throw out evidence if the police broke search and seizure rules (the Fourth Amendment) and that led to your misdemeanor charges.[12]

* You can challenge the quality of your lawyer if you think your lawyer didn’t do a good job, especially in busy courts where lawyers have lots of cases.[13]

* If you aren’t a U.S. citizen, being found guilty of a misdemeanor could affect your immigration status. The judge has to warn you about this.[14]

* Some jobs require special licenses, and having a misdemeanor can affect whether you can get or keep these licenses.[15]

* If you’re on probation or supervision and get accused of breaking the rules, there are special hearings with different standards and rules for showing evidence.[16]

* If your case is dismissed or you’re found not guilty, you might be able to get your record cleared (expunged).[17]


Understanding Plea Bargains and Lawyer Duties


In misdemeanor cases, lawyers and prosecutors often work out deals called plea bargains. This means the prosecutor might lower the charges or suggest a lighter punishment, and sometimes judges join these discussions too. These deals help people avoid going to trial and can lead to better results. Usually, plea bargains include talks about possible sentences and giving up certain rights. If you give up rights, like the right to appeal, it usually has to be in writing. Your lawyer is very important in these deals: they talk to the prosecutor, explain your choices, and help you decide whether to plead guilty or go to trial. Your lawyer must make sure you really understand your options. If your lawyer does not tell you about defenses you could use or possible lesser charges, and this hurts your decision, you might be able to challenge your lawyer’s work in court.[1]



To help you weigh these options, here is a simple decision matrix that compares what you might expect if you accept a plea bargain versus if you go to trial. This can also help you understand what your lawyer should do in each situation


Using the chart below, talk with your lawyer about which option fits your situation best. If your lawyer does not clearly explain both paths—including your rights, the evidence, defenses, and risks—they may not be meeting their duties to you. Visualizing these paths can help you make a more informed and confident choice.


You have the right to defend yourself in court instead of having a lawyer, but you must clearly agree to this and understand what it means. The judge will make sure you know what you’re facing, what the rules are, and the risks if you go without a lawyer. Defending yourself can be tricky, especially with all the rules and evidence. Even if your lawyer doesn’t win your case, they are still expected to make good decisions and use reasonable strategies during the whole process—from before the trial to sentencing. Judges usually trust lawyers to make choices unless they are clearly unreasonable or make mistakes that hurt your case. If your lawyer has a conflict of interest that affects how they defend you, it must be shown to have harmed your case. Judges also can’t punish you with a tougher sentence just because you didn’t take a plea deal. You have the right to go to trial without being punished for using that right.[2]


Recent Court Decisions Affecting Misdemeanor Defense


A recent court decision in Texas said that people who appeal Class C charges (like traffic tickets) and pay a bond to get a new trial in county court are still under the court’s control. This means they can ask the court to review if the law they broke is too unclear or vague. The court explained that things like having a complaint filed against you, a first conviction, and risking arrest or losing your bond mean you are still under state authority, so you can use pretrial habeas relief to challenge the law.[3]


This decision is important because it means that if you are appealing a Class C conviction in Texas, you can challenge the law itself before your new trial in county court. The ruling explains what counts as being under the court’s control in these cases.[4]


Footnotes


1. TX PENAL § 12.21

2. TX PENAL § 12.22

3. TX PENAL § 12.23

4. TX PENAL § 12.43

5. TX PENAL § 12.47

6. TX PENAL § 9.31

7. Barrios v. State, 389 S.W.3d 382 (2012)

8. TX PENAL § 9.33

9. TX PENAL § 9.41

10. TX PENAL § 9.22

11. Sony v. State, 307 S.W.3d 348 (2009)

12. TX PENAL § 8.02

13. Durden v. State, 290 S.W.3d 413 (2009)

14. Celis v. State, 416 S.W.3d 419 (2013)

15. TX PENAL § 8.03

16. TX PENAL § 8.05

17. TX CRIM PRO Art. 12.02

18. TX CRIM PRO Art. 12.04

19. Schmutz v. State, 440 S.W.3d 29 (2014)

20. TX CRIM PRO Art. 42A.101

21. TX CRIM PRO Art. 42A.103

22. TX CRIM PRO Art. 42A.111

23. TX GOVT § 411.072

24. Warmoth v. State, 946 S.W.2d 526 (1997)

25. TX CRIM PRO Art. 42A.382

26. Spakes v. State, 913 S.W.2d 597 (1996)

27. Beggs v. State, 597 S.W.2d 375 (1980)

28. TX CRIM PRO Art. 42A.103, TX CRIM PRO Art. 42A.111

29. TX CRIM PRO Art. 42A.382

30. TX CRIM PRO Art. 12.02

31. 25 AMJUR TRIALS 69, 10 A.L.R.4th 8

32. 98 A.L.R.3d 13, 184 AMJUR POF 3d 267, 11 A.L.R.6th 237

33. Ex parte Kleinman, 2025 WL 2169102 (Tex. Crim. App. 2025)

34. 42 No. 19 CRIMLWNEWS-NL 11


(Each footnote should match the number used in the main text and provide the relevant legal citation or case name as shown.)

OPTION PLEA BARGAIN TRIAL
OUTCOME Reduced charge/sentenc Possible acquittal or conviction
PROCESS No trial, quicker process Full trial, longer process
RIGHTS Give up some rights (like right to appeal) Keep all defense rights (including right to appeal)
LAWYER'S DUTIES Explain plea terms, prepare for options and consequences Advise on defenses, challenge evidence, ensure you understand options and consequences
RISKS May have record/penalty, cannot appeal most issue Risk of full penalty if convicted
BENEFITS Certainty, less stress Chance for full acquittal

Setra Law Firm, PC files expert challenges in state and federal court and represents clients at Daubert and Kelly hearings. If your case involves lab results, technical analysis, or expert opinions, reach out to discuss whether the testimony can be challenged and excluded before trial.