Make sure to bring your medication with you if you have asthma or other respiratory problems. Chemical weapons absorbed by or trapped under contact lenses may cause eye damage. Some people bring gas masks to demonstrations, although these attract police attention. If you choose to bring a gas mask, get an M17A1 or the equivalent, with shatter resistant lenses and replaceable, non-asbestos filters. Keep your skin free of Vaseline, mineral oil, skin moisturizers and make-up.
Chemical weapons bind with oily substances and become harder to remove.
Once clothing has been contaminated with chemical weapons, it should be removed. The projectiles cause deep bruises and can break bones, but the most serious risk is to your eyes. These visors are important to use over glasses or swim goggles, both of which can shatter. You should be able to get them at most drug stores. This will make the police and jail staff take you much more seriously if you start to have difficulties.