Originally Posted by
sfvoyage
Is this info still current and accurate... that I can go inside T3 with a DL boarding pass for T1?
TSA policy is now that you can go into any terminal of any US airport, as long as you have a valid boarding pass for a flight departing from that airport.
(Yes, SFO security is outsourced so they aren't actually TSA, but they still follow and implement TSA policies so that doesn't change anything)