Which of the following is a common mistake that compromises evidence at a scene?

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Preserving evidence integrity through careful handling and thorough documentation is essential at a scene. Contamination is the direct threat to that integrity: introducing foreign material, altering positions, or otherwise tainting items can change what actually happened and makes the evidence unreliable or inadmissible in court. At the same time, if evidence isn’t documented or preserved properly—where it was found, its condition, and who handled it—the chain of custody is weakened, raising questions about authenticity and origin. Together, these issues most clearly undermine the usefulness of the evidence. While not verifying chain of custody, photographing from multiple angles, or leaving before documenting are important considerations, contamination paired with poor documentation/preservation directly compromises what happened and what can be evidenced.