I'd agree with Simon. IF you were going to eat it, boil the hell out of it. We weren't advised to eat leafy green when I lived overseas. Apples, potatoes, etc, we soaked in bleach. Oranges we peeled. The one leafy green we did eat was cabbage in corned beef cabbage stew. So, toss it if you don't feel safe, boil it and add lots of butter and salt to make it palatable if you're bold is my advice. But then "the worse vice is advice".