It's very important to know your store coupon policies. You may consider printing these and taking them with you each time you shop with coupons.
CVS Coupon Policy
County Market Coupon Policy
Dollar General Coupon Policy
IGA Coupon Policy - Stores are independently owned. Contact your local store for their policy.
Kroger Print at Home Coupon Policy - This is the only information they have published regarding coupons. I've written and asked for more information and am waiting to hear back from them.
Meijer Coupon Policy - This is a general policy. Some Meijers also double coupons and you would have to ask your local Meijer for their policy on doubling.
Schnuck's Coupon Policy
Target Coupon Policy
Walgreens Coupon Policy
Walmart Coupon Policy/ Walmart Ad Match Policy