Poisoning has always been a popular method of getting rid of one’s enemies, but is there actually a “perfect” poison capable of being completely undetectable? Here are 6 of the poisons that have confounded doctors throughout history! Hosted by: Hank Green ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطا الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://www.britannica.com/science/metalloid https://www.dartmouth.edu/~toxmetal/arsenic/history.html http://jmvh.org/article/arsenic-the-poison-of-kings-and-the-saviour-of-syphilis/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1742758/pdf/v079p00391.pdf https://www.chemistryworld.com/opinion/marshs-mirror/2500415.article https://www.health.ny.gov/environmental/emergency/chemical_terrorism/cyanide_general.htm https://calpoison.org/news/acute-cyanide-poisoning https://emergency.cdc.gov/agent/cyanide/basics/facts.asp https://phys.org/news/2015-03-cyanide-poisoning-seconds.html http://ccn.aacnjournals.org/content/31/1/72.full https://www.washingtonpost.com/archive/local/2004/05/18/howard-teen-guilty-in-poisoning/d063a0ea-aa01-4f2b-90b6-3bfd901005ed/ http://www.slate.com/blogs/crime/2013/10/01/tianle_li_xiaoye_wang_why_thallium_is_known_as_the_poisoner_s_poison.html https://calpoison.org/news/thallium-poisoning https://www.ncbi.nlm.nih.gov/pubmed/6338655 https://www.theguardian.com/world/2013/nov/06/polonium-210-poison-alexander-litvinenko https://www.theguardian.com/world/2016/mar/06/alexander-litvinenko-and-the-most-radioactive-towel-in-history http://www.independent.co.uk/life-style/health-and-families/health-news/alexander-litvinenko-what-does-polonium-do-to-the-body-inquiry-andrei-lugovoi-and-dmitri-kovtun-a6824811.html https://www.chemistryworld.com/news/polonium-210a-deadly-element/3003225.article https://www.britannica.com/science/alpha-particle https://www.livescience.com/54901-free-radicals.html https://www.poison.org/articles/2007-dec/antifreeze-bad-for-your-kids-and-pets https://calpoison.org/news/diagnosis-treatment-ethylene-glycol-antifreeze-ingestion http://www.motherjones.com/environment/2014/01/inquiring-minds-deborah-blum-poison-forensics/ http://www.tandfonline.com/doi/full/10.1080/15563650701419011 https://www.webmd.com/a-to-z-guides/what-is-metabolic-acidosis#1 http://articles.latimes.com/1988-09-01/news/ga-4412_1_common-poisons https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3089829/ https://www.britannica.com/topic/cardiovascular-drug#ref295301 http://articles.latimes.com/1991-04-09/local/me-223_1_murder-case Images: https://commons.wikimedia.org/wiki/File:GHS-pictogram-skull.svg https://commons.wikimedia.org/wiki/File:Arsen_1a.jpg https://commons.wikimedia.org/wiki/File:Marsh_James.jpg https://commons.wikimedia.org/wiki/File:Marsh_test_apparatus.jpg https://commons.wikimedia.org/wiki/File:Sodium_Cyanide.jpg https://commons.wikimedia.org/wiki/File:Kaliumcyanid.jpg https://commons.wikimedia.org/wiki/File:Thallium_pieces_in_ampoule.jpg https://commons.wikimedia.org/wiki/File:Alpha_po_lattice.jpg https://commons.wikimedia.org/wiki/File:Ethylene-glycol-3D-balls.png https://commons.wikimedia.org/wiki/File:Samlpe_of_Ethylene_glycol.jpg https://commons.wikimedia.org/wiki/File:Glycolic_acid_3D_ball.png https://commons.wikimedia.org/wiki/File:Calcium_oxalate_crystals_in_urine.jpg https://commons.wikimedia.org/wiki/File:Nerium_oleander_flowers_leaves.jpg