Which search pattern is most often used for indoor crime scenes?

The correct choice is the spiral search pattern, commonly used for indoor crime scenes. This method involves a single investigator moving in a circular path either inward or outward from a specific focal point. The spiral search is particularly effective in confined spaces, such as a room or a building, where movement may be restricted.

For indoor environments, this technique allows the investigator to thoroughly examine the area without missing any evidence, as it systematically covers the entire space. Additionally, it enables the investigator to work closely around obstacles, which are often present in indoor settings.

In contrast, other search patterns, such as the grid or quadrant search, might be more suited for larger outdoor areas, where visibility and space allow for more extensive coverage. A lane search is typically used in linear environments, which might not apply effectively in the more complex layout of an indoor scene. Therefore, the spiral search's adaptability and thoroughness make it a preferred choice for indoor crime scenes.