What type of files are found on the left side of the two-part file system?

The correct answer is legal/investigation files, as these files are essential for maintaining documentation related to ongoing investigations and legal proceedings. In a two-part file system, one side typically contains more formalized documentation, directly related to the case's legal aspects.

Legal/investigation files can include case reports, evidence logs, witness statements, and other pertinent documentation that is necessary for legal processes. These files help ensure that all legal requirements are met and that there is a clear, organized record of the case, which is critical for transparency and accountability within the legal system.

Other types of files, such as general investigation files, monetary payment records, or structured treatment programs, may have their own designated sections within the file system, but they do not hold the same priority in terms of legal obligations and documentation requirements. Legal/investigation files are specifically tailored to address the intricacies of law enforcement and judicial processes, making them a fundamental aspect of a correctional or probation officer’s responsibilities.