What does the sense of "touch" allow police to detect during a search?

The sense of "touch" during a search is crucial for officers as it allows them to identify physical items on a person that may not be immediately visible but could be pertinent to their investigation or safety. This includes feeling for items like weapons, which are considered threatening, but in the context of the provided answer, it refers specifically to detecting nonthreatening contraband during a pat down.

This tactile perception enables officers to identify objects such as drugs or other contraband that might be concealed within clothing without being overtly obvious. While the other options mention various responses and materials that could be relevant during a search, the primary function of touch in this scenario is the ability to feel and recognize nonthreatening items that could impact the safety of the officer or the search process itself. Touch allows the officer to gain situational awareness about items that could either pose a risk or indicate further issues, aiding in both safety and compliance during the search procedure.