Arriving at BLR and MAA international terminals, I've seen checked bags coming out marked with a big chalk "C". Reportedly that means the bag needs to be physically inspected. Is that accurate, and how do they select which bags to mark? Wondering whether there is an airside scanner after the bags get unloaded from the plane. A friend told me that in his experience, when he flies with fancy hardshell bags, those get marked, whereas his cheap-looking bags don't. Anyone know the real story on this?