DNA evidence can play a substantial role in a criminal case, offering compelling evidence to counter or corroborate an argument. Understanding this type of evidence and its uses is crucial for anyone being accused of a crime in New York. Read on and contact an experienced Orangetown criminal defense attorney to schedule your free consultation today.
What is DNA?
DNA (deoxyribonucleic acid) is the genetic material found in most human cells. It carries instructions for the development, functioning, growth, and reproduction of organisms. DNA is structured as a double helix (a twisting ladder) and is composed of segments called genes. These genes carry the unique code that determines an individual’s physical traits and biological functions.
Since every person’s DNA (except for identical twins) is unique, it serves as a reliable form of identification, making it an important tool for forensic scientists and legal teams in criminal investigations. However, it’s important to note that its reliability depends on sample quality and interpretation.
What Types of DNA Evidence Are Used in Criminal Cases?
DNA can be recovered from a variety of sources. Some of the most common types of evidence used in criminal cases are blood, saliva, semen, skin cells, hair with roots or follicles, bone, teeth, and tissue.
What Role Does DNA Evidence Play in an NY Criminal Case?
DNA evidence plays an important role in New York criminal cases, acting as powerful and objective proof that can significantly influence the outcome of a trial. Because DNA analysis provides a link between an individual and a biological sample, it offers biological evidence that can corroborate or contradict witness testimony, alibis, and other forms of proof. Its high reliability makes it one of the most compelling forms of forensic evidence presented in a courtroom.
Prosecutors often use DNA evidence to establish the presence of the defendant at a crime scene or to link the defendant directly to the victim or to specific physical evidence, like weapons or clothing. For example, finding a defendant’s saliva on a cigarette butt left at a break-in site or matching semen found on a sexual assault victim to the accused individual serves as strong evidence of guilt. By submitting DNA evidence, prosecutors can more clearly meet the burden of proving guilt beyond a reasonable doubt.
DNA evidence is also important for the defense. If a crime scene sample does not match the defendant, it can create significant reasonable doubt, especially in cases where the identity of the perpetrator is the main issue. If DNA belonging to an unknown third party is found, the defense can use this to suggest an alternative offender or to argue that the prosecution has failed to conduct a thorough investigation. If the defendant was present at the crime scene but is contesting the nature of the offense, the absence of certain types of DNA evidence can be used to support their defensive strategy.
How Can DNA Evidence Help Already Convicted Individuals?
DNA evidence has been crucial in exonerating hundreds of wrongfully convicted individuals across New York and the country. Post-conviction testing allows biological evidence preserved from the original case to be re-analyzed using modern techniques. A DNA exclusion can provide definitive proof of innocence, leading to the overturning of old convictions and release from prison.
