This is incorrect. Antibiotics, growth hormones, all of that doesn't just disappear from the cow's bloodstream the instant it dies. Just one simple delivery mechanism: Meat is muscle tissue. It is full of blood. Blood carries the various drugs that the cow has been pumped full of to deal with eating corn. You EAT that blood when you eat the meat. Now, certainly some chemicals change when the meat is cooked, but they don't all disappear, nor do they necessarily change into something harmless. Some chemicals may become (more) toxic after being cooked.