What is the hydraulic needle effect?

• A. Discharge from a close distance that allows particles to penetrate the soft tissue of the eye or face
• B. A type of decontamination procedure
• C. A malfunction of the OC canister
• D. A method to increase spray range

Answer: (A)

The hydraulic needle effect is the phenomenon where spraying from a close distance creates a narrow, high-velocity jet that can penetrate soft tissues, especially around the eyes and face. When the canister is held too near the target, the spray doesn’t break into a wide mist but remains a concentrated stream with enough momentum to drive irritant particles through superficial tissues. That’s why the risk at close range is greater, and the description fits: discharge from a close distance that allows particles to penetrate the soft tissue of the eye or face. It’s not about decontamination, a malfunction, or increasing range.