Meat/eggs/dairy, definitely.

Vegetables, maybe, depending on what else they've touched.

Dry/canned goods, probably not unless they're wet (e.g if it's in a cardboard box or paper package and it's damp, it's not worth the risk - if we're talking about grocery store waste then for all you know that was water used to wash the butcher's work station or mop the floor).

Bacterial contamination is your primary concern, and after that mold. Salmonella could just end your life.