Which condition should be avoided when using shackles?

• A. Using at angles greater than 200 degrees
• B. Using with padded surfaces
• C. Using with multiple shackles
• D. Side strain in opposite directions

Answer: (D)

The main idea here is to keep restraint forces aligned along the limb you’re securing. Side strain from opposite-direction pulls creates a twisting, lateral load on the body. That sideways torque can injure joints, muscles, nerves, and blood vessels, and it makes the restraint shift or tighten unpredictably, which is dangerous for the person being restrained and for the person applying the restraint.

So, avoiding side strain in opposite directions is essential because it introduces torsional stress that the body isn’t built to handle, increasing injury risk and reducing control. Other conditions, like padding to reduce skin injury or distributing load with more than one restraint when used correctly, are manageable and can be beneficial, but they don’t carry the same inherently hazardous twisting force as opposing lateral pulls.