Though grocery stores are not required by law to print expiration dates on items other than infant formula and baby food, many items still bear the dates. Even though they are not required to remove items after the date shown, vendors use the dates as a guideline to ensure products aren't offered for sale after their freshness date has peaked.
However, it is very common for items to slip through the cracks. Most stores will offer a full refund if you end up with an expired purchase, but it saves time and money not to bring the item home in the first place.
Do you check for expiration dates at the store? Will you eat food that is past the expiration? Whose job is it to make sure expired products aren't left on store shelves?