What is the role of dye or tracer additive in some OC sprays?

• A. To neutralize the irritant and speed recovery.
• B. To increase the potency of the spray.
• C. It has no effect on identification or evidence tracking.
• D. To aid witness identification and evidence tracking; can affect decontamination but is typically safe and water-soluble.

Answer: (D)

Dye or tracer additives are included to help identify and document where OC spray was used. The dye leaves a visible mark on skin, hair, clothing, and surfaces, which helps witnesses, investigators, and officers pinpoint who or what was affected and when the spray was discharged. Some formulations are also designed to be fluorescent under UV light, making post-incident documentation easier.

Because the dye is usually water-soluble and safe, it can be rinsed away with standard decontamination efforts, though it may temporarily stain or transfer to other materials and require follow-up cleaning. This helps with evidence tracking by clearly showing contact areas while not interfering with the spray’s primary purpose.

The dye is not meant to neutralize the irritant or increase its potency, and it does indeed have a meaningful role in identification and evidence tracking; claiming otherwise would miss the practical purpose of adding the tracer.