Walking out without paying

I just picked up this prescription from CVS. It had a note attached saying they didn't have all meds in stock, so it was only partially filled.

So, what did the clerk do? She gave me the pills and told me to come back tomorrow to get the rest. And, oh by the way, I should pay then too.

I'm just shocked by this incredibly sane policy.

Best Buy doesn't trust me enough to let me handle a digital camera without being tethered by a security cable, and CVS lets me walk off with unpaid drugs.

Way to go CVS, you guys rock.

--Ben