Family Dollar accepts manufacturer and store coupons and allows them to be stacked, as long as neither coupon states it is not valid with other coupons.
They will not accept expired or competitor coupons.
Internet coupons must scan in order to be accepted.
Buy 1 Get 1 Free coupons are accepted, completely free item coupons are not.
Cash back will not be issues when the value of the coupon is greater than the purchase price.
You can view the entire policy HERE