The government has been found to be using a new form of tear gas that has chlorine components during the Portland Uprising. On the night of July 27th, protesters noted that the gas that day was green and smelled more toxic, like chlorine. A further investigation soon proved their worries to be true.
On the 27th of July in Portland, federal agents and police were found to have been using a new kind of tear gas, that has 3 carcinogens in it and was first used against the protesters against the Governor in Puerto Rico.
A detailed report on the tear gas can be read here: Defense Technology 1026 – Triple-Chaser Separating Canister CS – US
The carcinogens include lead salts, methylene chloride, and hexavalent chromium. All are known to cause cancer, and lead salts are also known to cause birth defects or other reproductive harm.