How do I know what ingredients have or don't have nuts? (or have come into contact with nuts)?

Question

I wanna bake cookies for my friend, who is allergic to every type of nut. I've never had to eliminate nuts from anything so I feel kinda dumb asking, but are ingredients usually nut-free? Like flour for instance, is that completely nut-free? And what about cake-mixes? I know, dumb question, but I don't wanna poison her XP

Answer 1

Cake mixes should be nut free if the ingredients do not include nuts. Same with flour, butter, sugar, spices.