Also, for those with fears about people potentially "gaming" the system, let's stop for a moment, and consider this:
Anyone who *geniunely* needs that DAS won't be running the standard queue if they have a DAS for that attraction, ever. The reason is simple - if you have a DAS for that ride or attraction, there's a reason you cannot utilize that queue. That's all the DAS is for - to help the Guest wait *outside* the standard queue environment. It's a virtual queue, a way to wait your turn like everyone else, just outside the ride or attraction queue.
Anyone who *does* pull that kind of nonsense (get a DAS return time, then line up to ride in the regular queue, and then use the DAS return time) should not be surprised if they are flagged in the system, and/or find out that the DAS has been cancelled by the use the standard queue when they tapped in with their Magic Band.