What is the purpose of field notes and property/evidence tags?

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The purpose is to create an accurate, defensible record of what was observed and to maintain control and identification of seized items. Field notes capture a contemporaneous account of observations—times, locations, conditions, behaviors, and actions taken—which helps later reconstruct what happened and supports the official report and any potential testimony. Property/evidence tags attach unique identifiers to each item, describe it, and document its linkage to the case, including who handled it, where it’s stored, and any transfers of possession. Together, they preserve the integrity of evidence, support chain-of-custody, and enhance admissibility in court. Storing personal notes or attempting to replace the official report would not meet these purposes, and failing to properly tag or document can increase risk to the case's credibility.