Which search method starts from the center of a crime scene and spirals outward to the perimeter?

The spiral search method involves starting at a focal point, typically the center of a crime scene, and moving outward in a circular or spiral pattern towards the perimeter. This technique is particularly effective in scenes where the evidence may be scattered or where the scene is not well-defined, allowing the investigator to thoroughly examine the area while ensuring they do not miss any crucial evidence.

The spiral approach minimizes the chances of overlooking key evidence that may be located further away from the central point. It is useful in a variety of scenarios, including outdoor scenes or when investigating a crime that has a broad area of interest. The method can be conducted in either an inward or outward spiral, but the outward spiral, as described in the question, is commonly used to prevent contamination of evidence.

Several other search methods exist, such as the zone search, which divides the scene into smaller sections, the line search, which uses straight lines to cover larger areas, and the grid search, which is a more systematic approach combining two overlapping line searches. While these methods each have their own benefits and specific applications, the spiral search is unique for its focus on a central starting point and methodical outward examination.