What is not a purpose of investigative subpoenas?

The purpose of investigative subpoenas is primarily to facilitate the gathering of information and evidence necessary for legal investigations and proceedings. They are tools that allow parties involved in litigation to obtain documents, testimonies, and other relevant materials that can help in building a case or understanding the details of a matter at hand.

The option that states dismissing unnecessary complaints does not align with the function of investigative subpoenas. Dismissing complaints is more related to the judicial process or the discretion of a judge or governing body, rather than the role of a subpoena. The goal of an investigative subpoena is to collect evidence or information, rather than to evaluate the merits of a complaint to decide if it should be dismissed.

In contrast, obtaining necessary documents for a case, gathering relevant information related to investigations, and clarifying complex issues are all valid purposes of investigative subpoenas. They are employed precisely to support the investigation process by providing access to crucial information that could affect the outcome of legal matters.