Which document serves to maintain custody of evidence or property?

The document that serves to maintain custody of evidence or property is the evidence/property custody report. This report is essential in law enforcement as it provides a clear, organized record of all items collected as evidence. It outlines who collected the evidence, when it was collected, and where it is stored, ensuring a chain of custody that is crucial for maintaining the integrity and reliability of evidence in investigations and in court.

Involving this procedural documentation helps prevent any loss, contamination, or misplacement of evidence, which can jeopardize cases. Properly documenting the custody of evidence protects the rights of individuals and upholds the due process, as it allows all parties involved in the legal process to track the evidence from its collection to its presentation in court.

The other options do not align with this purpose; for instance, field test results document testing outcomes but do not ensure evidence custody, while desk journals and field interview cards serve different roles in recording information and observations, rather than maintaining evidence custody.