How tight should handcuffs be applied to ensure safety?

Applying handcuffs with only one finger's width of space is considered optimal for safety and control. This allows for enough room to prevent excessive constriction of circulation while still securing the individual. The goal is to balance security with the need to avoid any potential pain or injury, which can occur if the cuffs are too tight.

When handcuffs are applied too tightly, they can lead to significant discomfort, compromised blood flow, and potential injury to the wrist. Conversely, handcuffs that are too loose may allow the individual to slip out, increasing the risk of escape or self-harm. Therefore, the one-finger rule emerges as a practical approach, allowing for both the effectiveness of restraint and the protection of the individual's well-being.