Which search technique aims for the location of very small objects while maintaining a strict chain of custody?

The technique that specifically aims for the location of very small objects while ensuring a strict chain of custody is the containment search. This method involves securing a designated area to prevent any potential loss or contamination of evidence, which is particularly critical when searching for small items. By containing the area, searchers can systematically examine it, ensuring that every object is accounted for and logged properly, which is vital for maintaining the integrity of any evidence collected.

In contrast, the other search techniques mentioned do not focus primarily on maintaining a strict chain of custody or may not be as effective at locating small objects. For instance, an area search might cover a larger space following a grid pattern but does not guarantee strict custody protocols for small items. A hasty search is typically more about quickly locating victims or evidence before it is lost, often sacrificing some level of meticulous documentation. Loose grid searching allows for some flexibility, but it lacks the structured approach necessary for preserving evidence, especially tiny items.