Ricin immunogenic in mice, rabbits, and humans. It has completed two successful clinical trials. Ricin has been involved in a number of incidents. In 1978, the Bulgarian dissident Georgi Markov was assassinated by Bulgarian secret police who surreptitiously shot him on a London street with a modified umbrella using compressed gas to fire a tiny pellet contaminated with ricin into his leg. He died in a hospital a few days later and his body was passed to a special poison branch of the British Ministry of Defence (MOD) that discovered the pellet during an autopsy. The prime suspects were the Bulgarian
Ricin James Mattis, and the other to Chief of Naval Operations, Admiral John Richardson. Ricin has often been used as a plot device, such as in the television series "Breaking Bad" (Season 2, Season 4 and Season 5). Ricin pellets were also used as the murder weapon in the "NCIS Season 7 Episode 21 – Obsession" The popularity of "Breaking Bad" inspired several real-life criminal cases involving ricin or similar substances. Kuntal Patel from London attempted to poison her "controlling and selfish" mother with abrin after the latter interfered with her marriage plans. Daniel Milzman, a 19-year-old former Georgetown University student,