Personally, I think the Walgreens coupon policy is one of the most difficult to understand. It's not terribly restrictive just complicated by their Register Reward coupons. I'm thrilled that they are willing to write it out for their customers.
I would encourage you to print out a copy of this policy to keep in your coupon binder or carry it with you whenever you shop at Walgreens.
You can view the new policy at Walgreens.com.
(Thanks, Wild for Wags)