Standard practice on prettymuch every DL flight I've ever taken. They call-out the zones, but it's generally a free-for-all. It's routine to see gate lice board when PREM is called. I rarely see anyone rejected by a G/A, and half the time they don't even look at the BP they're scanning. I'm sure it's awkward for a GA to send a person on the Walk of Shame, so most don't bother.