Which of the following is NOT a necessary duty when conducting a preliminary investigation?

The duty of releasing evidence to the property owner is not considered a necessary part of conducting a preliminary investigation. Instead, it is crucial for law enforcement to secure and preserve evidence at the crime scene to ensure the integrity of the investigation and potential prosecution. Evidence may need to be collected, analyzed, and maintained for legal procedures. Releasing evidence prematurely could compromise the investigation or violate legal protocols.

In contrast, documenting the crime scene, interviewing witnesses, and gathering physical evidence are all foundational components of a preliminary investigation. Documenting the crime scene helps establish a comprehensive record of what occurred, while interviewing witnesses can provide valuable insights and perspectives on the incident. Gathering physical evidence is essential for creating a robust case supported by tangible items linked to the crime. All of these actions are vital for building an accurate and effective police report and for ensuring that the investigation proceeds with thoroughness and attention to detail.