Always know your stores policy!
Every store is entitled to change their policy without notice or posting.
Coupon policy will/can be different per store. This all depends on the manager. Corporate will set the guide lines but the fine lines are enforced by individual managers. Some are more lenient than others, I’m sure you’ve noticed?
I find it better to ask sales associates that you recognize and you've noticed does a great job with customer service, for a copy of their policy. Do this on an off time and you will be able to see just how coupon friendly they are. If there’s a question ask a manager in a respectful attitude. If you shop at the same stores they will recognize you as well and become more friendly and helpful with you because you care about having a coupon policy and find you respectful to their rules.
They want your business.