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# What the Defense Does in a Criminal Case
June 26 2026
Written by CityWatch.
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THE LAW - The prosecution for a criminal case often relies on the services of police detectives, crime scene investigators, lab technicians, and trial attorneys to successfully prosecute a defendant.
The Federal Bureau of Investigation (FBI) reported that police made 14 million arrests under reasonable suspicions of criminal activities in 2024. This means that most areas have a dire need for criminal defense lawyers.
A crime committed in a state does not always mean that a case will be under state jurisdiction. According to the legal website , the agency that will prosecute the case (state or federal) depends on the type of crime, who was involved, and other factors.
On the other side of a criminal case is a legal defense team. The team is an organized legal function that intends to act as the adversarial check on prosecutorial authority.
The task of a criminal defense lawyer is to see whether the law enforcement bodies and the prosecution observe the law as prescribed by the U.S. Constitution or not. Violations that might occur include illegal searches and illegal arrests.
Understanding how a court functions, who is involved in the process, and why certain elements are observed in legal proceedings can significantly help individuals understand how criminal cases are handled by their respective law courts.
**The Obligation to Investigate Independently**
**[What does the defense do in a criminal case?](https://www.barnettfalls.com/blog/2024/06/what-does-the-defense-do-in-a-criminal-case/)** A defense attorney doesn’t have to just swallow the prosecution’s version of events. The duty to conduct an independent investigation is one of the most important things in criminal defense.
The defense must talk to witnesses early. They should also recheck the physical scene of the alleged offense. They can be tasked with retrieval of video surveillance and other records on time. Defense attorneys are also equipped with skills to identify evidence that the prosecution has not presented.
Defense investigators go in search for witnesses that police did not really think about. They can record mismatches between the actual physical proof and the prosecution's narrative. In some cases, they can even build time sequences that don’t line up with the opposing party’s account.
When forensic work is central to the case, the defense has the right to summon an expert of its choosing to analyze the case and verify the prosecution's conclusions. This independent look has led to exonerations when the prosecution's forensic evidence turned out to be wrong, poorly tested, or presented in a misleading way.
The American Bar Association Criminal Justice Standards lay it out pretty clearly: independent investigation is a core obligation of defense counsel, not some optional extra feature. A defense that is only built around what the prosecution decided to share and is not really a complete defense.
**Challenging the Evidence Before Trial**
In a criminal defense case, lawyers will make most decisions before the trial by using motions. One of the common motions is known as the motion to suppress, where the lawyer seeks to have certain evidence ruled as unconstitutional and thus not admissible.
The evidence in question may include items collected during an illegal search, confessions extracted without the due Miranda warning, and other unreliable identification processes.
A successful suppression motion means that evidence would be thrown out and thus could lead to lighter or dropped charges for the defense.
The lawyer can also make a “Daubert” and “Frye” motion to challenge forensic evidence. This move could be made with the aim of questioning the applicability of expert accounts.
**Cross-Examination at Trial**
Cross-examination is described as a process of trial in which the prosecution's case is evaluated (by way of examples and illustrations from witnesses) by pointing out inconsistencies and inaccuracies in the prosecution's case.
Defense lawyers do not argue with the witnesses. Instead, they make use of previous statements, documents, and physical evidence to attack the credibility of the witnesses.
For instance, defense lawyers will attack the police officers' credibility by showing that they were not in clear view of what happened.
**Reasonable Doubt: What It Requires**
In each offense, every part must be proven to a reasonable certainty.
Certainty is not interchangeable with reasonable doubt. It’s more like doubt grounded in reason and everyday judgment, based on what the evidence says or the lack of evidence at all.
When a defense highlights holes in the investigation, contradictions in what witnesses say, or the boundaries of forensic conclusions, it’s establishing the idea of reasonable doubt. This approach is legitimate and also constitutionally allowed.
The burden of proof is shared. The defense does not have to go first and can choose not to present a case if the prosecution has not proven its case beyond a reasonable doubt.
If a defendant rests without presenting evidence, that’s using a constitutional right, not admitting that he or she is guilty of the charges involved in the case.
**Plea Negotiations and Sentencing Advocacy**
The majority of criminal cases tend to end with plea bargains more than they do with a trial.
Negotiating a criminal plea deal is one of the most important aspects of criminal defense. The criminal defense lawyers analyze the strength of the case brought forward by the prosecution, gauge the risks involved in a trial, and enter into a plea bargain agreement that reflects the reality of the situation.
The best time to undertake a negotiation is after the process of discovery is complete and the court has ruled on pretrial motions.
Should the case proceed to the sentencing stage, then the defense presents the mitigating circumstances surrounding the case, such as the background of the defendant, his/her work, and involvement in the community.
**The Defense Exists Because the Alternative Is Worse**
Criminal defense exists not to help defendants earn sympathy but to uphold fairness in trials.
History has plenty of examples of what tends to happen when the aspect of criminal defense is missing or just too weak. You see wrongful convictions and coerced confessions. Evidence that should’ve been exculpatory will get suppressed. In some cases, sentences get shaped more by inequality than by the actual facts.
A defense attorney’s role in a criminal case is to help a particular client and protect the integrity of the whole justice system.
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