They had tranquilizers and people who were stationed in the portal room in places no one could see behind power barriers, like the ones in the old quarantine rooms.
Paperwork is... not a problem. Computers will need to be hacked. I've gotten a few of them up and running, but all these servers are old IBM OS/2 based servers from the late 90s. Government had a contract with them, so good luck finding any parts we might need for them.
We definitely need to setup a schedule rotation on that portal door immediately. And get security for those people.