What role does evidence play in criminal investigations?

The role of evidence in criminal investigations is fundamental as it helps establish the facts of a crime. Evidence includes physical items, testimonies, and documents that can corroborate the circumstances surrounding a criminal act. In a criminal case, evidence can confirm whether a crime occurred, link a suspect to the crime, and demonstrate elements such as motive, intent, and opportunity. The integrity and reliability of the evidence collected during the investigation directly influence the legal proceedings that follow, from pre-trial motions to potential convictions.

The other options do not accurately capture the primary function of evidence in criminal investigations. While evidence can play a part in plea deals or sentencing, these aspects are secondary to its primary role in proving or disproving elements of a crime. Additionally, evidence is not limited to civil cases; it is a vital component in criminal proceedings, making the correct choice clearly indicative of the evidence's primary role in the justice system.