"Policeman should have soaked a thin cloth in water and tied it to their face before going close. This is a primitive measure but is essential to protect the eyes, nose and mouth to ensure that the pulmonary airways don't get affected," said Dr. V. V. Pillay, Head of Department of Analytical Toxicology and Forensic Biotechnology, Amrita Institute of Medical Sciences and Research (AIMS), Kochi, in a talk held at Goa Medical College and Hospital (GMC), Goa.