In which type of case can investigative reports be used?

Investigative reports can be used in both civil and criminal cases by any party involved, making the most comprehensive answer option one that covers both scenarios. Specifically, in criminal cases, such reports are often critical for the defendant's strategy, allowing them to challenge the government's case or present favorable evidence. The admissibility and the way these reports are utilized, however, can vary based on jurisdiction and specific circumstances, but generally, they serve as essential tools for both sides in litigation.

It's important to understand that while investigative reports can be especially beneficial in criminal cases for the defense to argue against government claims, the capability to use such reports is not confined to just one type of case or one party. In civil cases, for instance, plaintiffs or defendants can also utilize investigative reports to support their claims or defenses, which broadens their applicability significantly. Thus, stating that they can only be used by defendants in criminal cases does not encompass the broader legal framework regarding the use of investigative reports.