The Prosecution's Case During the presentation of evidence, a lawyer must live up to the promises made during opening statements. To convict the defendant, the prosecution must demonstrate beyond a reasonable doubt both that a crime occurred and that the defendant committed it. Without detailed proof to support these two theories, the prosecution cannot prevail. The prosecution tries to persuade the jury that the defendant is guilty by introducing evidence. These includes weapons and blood samples, as well as the arresting officer's police report.
Prosecutors often present physical evidence as a part of their questioning of witnesses.
You've testified that you had the opportunity to examine it. Experts are often used to explain the results of DNA or ballistic tests. After the prosecution has questioned its witnesses, the defense lawyer has the chance to question them. During this process, called cross-examination, the defense attorney will try to undercut any damaging testimony. He or she will try to make these witnesses appear unreliable.