ORD has card readers before the checkpoint for all badged employees. The cards are secured by fingerprint or PIN. There is a red light / green light for the TDC to see-- yet they still go through the checkpoint.
All easily bypassed. If anything magstripe+pin is more secure than magstripe+biometric. Many of the biometric readers out there can be
bypassed with the creative use of gummy bears.
I also hate many of those fingerprint readers -- some of them won't work with my often-dehydrated body. But those same ones seemed to be happy with the gummy bear.