What are restraint devices primarily designed to do?

Restraint devices are specifically designed to temporarily restrict a subject's movements, which is essential in a law enforcement context for ensuring safety and control during an encounter. By limiting mobility, these devices help prevent individuals from fleeing, causing harm to themselves or others, and allow officers to manage potentially dangerous situations more effectively.

The primary purpose of restraint devices, such as handcuffs or other immobilization tools, is to maintain control over a subject who may pose a risk to the officers, themselves, or the public. This temporary restraint is crucial in various situations, such as arrests or detaining individuals who may exhibit aggressive behavior.

The other options do not accurately reflect the primary function of restraint devices. Allowing mobility runs counter to the purpose of restraints, providing comfort is not their aim since they are designed for security and control, and facilitating communication while important, is not the main function of these devices.