If you are planning to board Amtrak buses in San Francisco, be prepared for some insane TSA-style security checks:
Upon entering the facility, passengers must show your Amtrak ticket or photo I.D. to the Greyhound Security Staff. Greyhound security will also inspect bags and wand passengers for metal contraband who enter the building. Please allow additional time arriving for this process.
So now you can’t even enter a bus terminal without a security check.