Yep, it is back. Nasty stuff that it is. I am not convinced that it is harmless.
That is just one of the reasons that I do not purchase ground beef. I get briskets and grind them myself. I know what is in it. Perhaps I am a control freak.
A home meat grinder (electric or manual) is not expensive and pays for itself in a few uses. Right now, ground beef is going for 4.75 a pound in this area. I can get a brisket for 2.79 a pound. Simple math.
Now, get your grind on and have a fat juicy med-rare burger!