How can an officer place a subject at a disadvantage during a Terry frisk?

The correct answer emphasizes that having a subject put their hands behind their back can significantly limit their ability to move and react. This position not only restricts the individual's freedom of movement but also places them in a submissive posture, which can enhance the officer’s control over the situation during a Terry frisk. When a subject's hands are behind their back, they cannot reach for concealed weapons or other objects that might pose a threat, allowing the officer to conduct the frisk with a greater sense of safety and control.

In comparison, options that require the subject to kneel, stand on one leg, or walk backward do not inherently restrict their ability to access their body and may introduce more subsequent movement unpredictability, which could compromise officer safety. Thus, the technique of having a subject place their hands behind their back is a prudent approach in law enforcement practices aimed at ensuring both the officer's and the subject's safety during an encounter.