You know the phrase. Offer valid at participating locations. Or something along those lines. I'd never run in to a non-participating location until moving to Hawaii. Here, they never participate in nationwide promotions. Sign seen today at the register at KFC Hawaii on Kapahulu Ave:
This is about the norm. Stores have to put up signs like this when a nationwide coupon mailer goes out and everyone in Hawaii ends up with the coupons that aren't valid here.
Perhaps the bigger question here is why was I eating at KFC?