To Coupon Or Not To Coupon?!?!?!

I've heard a LOT of conflicting info, so let's settle this. Can customers use their coupons this weekend or not? I've heard that they work but only in-store, that they're completely void, that they might work but only apply to items that aren't on sale. Your boy is CONFUSED. Yes? No? Maybe so? Will they work but only for things that aren't candles? Will they be completely void the whole weekend? Will it be a separate transaction sort of situation? Pls help. I don't usually work reg, but I don't wanna make our cashier's lives harder with misinfo.