To evaluate the effectiveness of mass decontamination, you could?

• A. use M8 or M9 paper.
• B. have victims remain unclothed to assess for blisters.
• C. delay decontamination to accurately assess victims.
• D. swab the victim's mucosa.

Answer: (A)

Evaluating decontamination effectiveness in a mass-casualty setting hinges on having a quick, on-scene indicator of whether contamination remains. Chemical agent detector papers like M8 and M9 are designed for exactly that purpose. When you apply these papers to exposed skin, clothing, or surfaces, they produce a color change if chemical agents are present. After decontamination, reapplying or testing with the papers gives you an immediate readout: no color change suggests the agents have been removed or reduced to undetectable levels, while any color change indicates residual contamination and the need for additional decon.

M8 paper is used to detect agents on skin or garments, providing a rapid field check of person-to-person or person-to-clothing contamination. M9 paper is used on surfaces to detect contaminated surfaces or equipment. Together, they give a practical, quick way to confirm whether mass decontamination was effective without waiting for lab results.

The other options aren’t suitable for this purpose: asking victims to stay unclothed to look for blisters is impractical and unsafe in a field scenario, delaying decontamination would prolong exposure, and swabbing mucosa does not provide a valid or safe measure of external decontamination effectiveness.