Counterfeit coupons are a big deal. You can be prosecuted and put in jail for using counterfeit coupons. It is your responsibilty to make sure the coupons you use are not counterfeit. If the coupon looks to good to be true IT IS! Make sure coupons you print from the internet are from the companies website. You can always check this site for photos of counterfeit coupons.
Here is one that is circulating right now. Free Kraft