No Mobile Coupons

I went to Duane Reade to pick up a prescription and use my coupon that was soon to expire.

I checked out at the manager's station, he just happened to ask for the next customer when I was at the front of the line. 

He asked if I had a rewards card, I said, yes... And also a coupon. And set my phone on the counter. 

He proudly announced that they couldn't accept mobile coupons because they can be used over and over. If you notice, it states on the coupon, beside the bar code, print or show it on your phone. 

Scan it pal!