Ricin the attack on Georgi Markov another Bulgarian defector, Vladimir Kostov, survived a similar attack. Kostov was standing on an escalator of the Paris metro when he felt a sting in his lower back above the belt of his trousers. He developed a fever, but recovered. After Markov's death the wound on Kostov's back was examined and a ricin-laced pellet identical to the one used against Markov was removed. Several terrorists and terrorist groups have experimented with ricin and caused several incidents of the poisons being mailed to U.S. politicians. For example, on May 29, 2013 two anonymous letters sent to
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,