If you have a 100% customer satisfaction guarantee I'm well within my rights to return the item because I want a bigger size, don't like the color, or I just want a new one. I may be abusing the spirit, but not the letter. If you don't like this nasty secret, change your stupid policy. And watch me never buy from you again. Because it is exactly this policy that makes up for the crappy service, bad pricing, stupid merchandising, and megalith stores.
Returning something you didn't buy is theft.
Chemical Physics - you didn't want to be a premed and weren't smart enough to be a Physicist?