Not being able to distinguish between two tagged objects has been a big headache for the airline business. On one hand, Radio frequency identification readers save labor because they don't need to be aligned with the tags. On the other hand, a device might read several tags at the same time, without knowing which specific piece of luggage the tags are tied to.
The new software from Alien Technology will be able to discriminate between different bags, and provide such information as where the bag is going and whether a certain piece of luggage is supposed to be searched by Customs.
Read more here