This is true because ricin is not contagious, and is unable to spread from normal skin to skin contact. Ricin is not known for being passed easily from person to person, so it is considered a category B agent. Especially when it can’t harm you until it gets into your system. So inhaling ricin from the public air is very unlikely to happen. Yet, once into your system, ricin does it’s work once it gets into the cells of the body. Once into the cells, it prevents the cells from making any proteins necessary. This effects the cells within the body because without proteins within the cells, they will die. With the process continuing, it will be harmful to the whole body and may cause death.
Back in 1940, the U.S. military did some experiments with using ricin as a possible agent in warfare. According to emergency.cdc.gov, some say that the U.S. used ricin in Iraq. Another incident with ricin was back in 1970s, when a journalist was attached in London, a man injected a ricin pellet into his system. In the past, there has been threats from other countries to use biological attacks, but it is more likely for them to use other methods such as firearms and