Well my God, according to the genius earlier who repairs these systems the IR scanners would detect the volume and compare it against a database of specific gravities. It should have let you bag the item.
I'm 36 and I can check like a motherfucker. Used to be the fastest checker at my store when I did that in college, but of course I couldn't have the job officially b/c I didn't have enough seniority. Ah, unions, protectors of mediocrity.
They should just time everyone. If it takes you, on average, more than 6 seconds to scan and bag item, you're banned from self-checkout for life. If you try to use the lane anyway, your credit card will be charged $250,000 when you try to pay.
Yeah, the one at my store will bitch because something doesn't settle right in the bag or a corner of something hangs off the edge of the scale. It also seems to be able to detect items as light as a postcard.
Yeah they do, they get me out of the store quicker. Fortunately most of the morons in my area still use the regular lanes. When all those retards discover the self checkout lanes, the store had better add 20 more in a fucking hurry or I might finally snap.