Here is the rebuttle piece
http://www.nytimes.com/aponline/2010/01/01/business/AP-US-Beef-Ammonia.html?scp=7&sq=hamburger&st=cse
And McDonalds does use the “Window Cleaner Laden Beef” ;) after all, you don’t get 99cent burgers without the slop sweepings from the floor, gotta kill all that entrail bacteria somehow ...