A few years ago I took a different route to normal to SEA from LHR via MSP. On boarding the MSP->SEA leg we were told, over the PA system that we could put away our photo id as it was not legal under state law to ask for it and a boarding card would suffice.

Given the fact that you can buy a ticket online, check in electronically and board without any ID, how can there be any pretence of security and, for that matter no-fly lists. Does anyone know if this has changed at all and is this state of affairs more widespread than just MSP?