Like DNA, each person has his or her own individual fingerprints. If police found yours at the crime scene, expect the prosecution to present this information in court. If you confessed to the crime with which you are accused, prosecutors can generally present this information at trial. Technicians laboring in crime labs can ascertain whether bullets found at the crime scene match the type of bullets fired by a gun you are known to own, and, in some cases, whether they match your specific firearm. If the state has charged you with murder or manslaughter, the county coroner's office will likely perform an autopsy on the victim.
Autopsies can help determine the cause of a person's death.
Professionals not directly involved in your case, but who can nonetheless speak knowledgeably about certain aspects of it, are called expert witnesses. For example, a scientific expert witness may explain DNA testing to a jury and note whether your DNA matched the DNA found at the crime scene. A ballistics expert may note whether the bullets fired could have come from your gun. Prosecutors and defense lawyers will sometimes solicit expert testimony to bolster their cases. Circumstantial evidence is a fact or series of facts that point to your guilt.