A Question of Curd

My wife took a bite of her salad Sunday night and instantly decided that the bleu cheese had gone bad, but-- despite the fact that she has a more acute sense of smell than me-- I questioned her judgement because I'm not sure there is any way to ascertain if certain stinky cheeses (such as Roquefort, Limburger, and Stilton) have passed their prime . . . and though we checked the package and found that the cheese was three days beyond the expiration date, I could taste no difference and I suffered no adverse effects from the slightly stinkier stinky cheese.