The phrase "deadly poison" refers to a substance that is extremely dangerous and can cause serious harm or even death if consumed or exposed to. Full definition
Not surprisingly, his appointments and budget decisions had effect of deadly poison, administered to the American scientific enterprise. (defyccc.com)
Even then, your veterinarian may hesitate to mention the possible cause, the result is yet another six - months dose of potentially deadly poison! (thedogplace.org)
Romance and a path to victory means being prepared to consume deadly poison at any moment. (mutantreviewers.wordpress.com)