What typically happens during the first step of a criminal investigation?

During a criminal investigation, the first step is crucial in ensuring that the integrity of the crime scene is maintained. Securing the crime scene is essential to prevent contamination or alteration of evidence. This involves establishing a perimeter to restrict access, allowing only authorized personnel to enter. By documenting the scene through photographs, sketches, and notes, investigators create a comprehensive record that captures the environment and any pertinent details at the moment the crime is discovered. This foundational step is vital for the successful collection and analysis of evidence later in the investigation process, as it helps establish context and can significantly influence the outcome of the case. Without securing and documenting the crime scene correctly, the investigation may face serious challenges regarding the admissibility of evidence and the overall understanding of the crime that occurred.