In the collection of evidence at a suspicious fire scene, which step did the officer incorrectly execute?

The step regarding the proper storage of evidence at a suspicious fire scene is critical for maintaining the integrity of the investigation. Storing evidence in the engine company's office is not appropriate because this can lead to a lack of secure and controlled conditions necessary for evidence that might be used in legal proceedings. Evidence must be stored in a designated evidence locker or similar secure location that is monitored and controlled to prevent tampering, loss, or contamination.

The other steps listed emphasize the importance of proper evidence handling procedures, such as ensuring there is a chain of custody by having the evidence in the hands of someone available to testify, photographing evidence before collection to document its condition and location, and not leaving evidence unattended, which all serve to protect the quality and reliability of the evidence as it relates to the investigation and any subsequent legal actions.