I have some beef shanks I bought four days ago that I want to make. I'm not sure if it's my imagination, or if there's the slightest green tinge to them now. The smell is very faint but a tiny bit sour. Again, this might be my imagination. I'd love to eat them but I don't want to get sick. Also, I know that I tend to be a bit paranoid about meat freshness.
A few weeks ago, I bought a chicken and was convinced that it was bad -- it smelled sour to me, not good. But I had a few friends who were over smell it and they all said it was fine and smelled like regular raw chicken. I ended up cooking it in the crock pot and it turned out delicious. We all ate it and no one got sick.