That Steak Was Rotten

You’re not safer:

Shoppers often choose meat out of the grocery case based on how fresh it looks,
but meatpackers have started packaging fresh meat in a “modified
atmosphere” that masks telltale discoloration and decomposition of
days-old meat. The process involves pumping oxygen out of and carbon monoxide into an airtight container. The deception has occasioned numerous protests from consumer groups.