Awhile back I took a bunch of different job site requirements and their graphic and put them into an online form for my workers if they think there is an impact. It gives them quick access to some overview of what to do when there is a possible impact.
One large general contractor uses a 1, 2, 3, 4 classification.
#1 is the sick person
#2 has had close contact with a #1 and needs to quarantine and now added get tested.
#3 has had casual contact with a #1, no need to quarantine or get tested but should watch for symptoms. They could be tested if they wanted too now.
#4 has had close contact with a #2 or #3, they are "free to move about the cabin" per say.
It seems to help, I need to update the close contact stuff but its a compilation of a bunch of different sites rules.
On job sites I have seen lots of technology being used to help isolate folks prior to entry and then during the work shift. Some of it is pretty cool.
RFID badges used on some sites that track down to the actual room you enter and it figures out when a person goes positive who was in the same area or room, I'm not 100% on the distance it tracks or if it's just the same room. But there is a transponder in each room.
Other sites have an iPad style temperature check station that takes your picture and temperature tells you what it is, and it even knows if your wearing a mask, it tells you to please wear your mask if your not wearing it at time of the test.
Another site actually uses your wrist area to check your temperature. Thought that was pretty slick it looks like a TSA metal.detector and you hold your arm up and close to the sensor.
If you run hot on your forehead with like an IR your allowed to sit for a few minutes and try again, also can try the back of your neck area.
Have to be careful with some industrial.temperature guns the emissivity is not set up for skin, I think it needs to be 90% and most are 95%, it can give you a reference set so you can tell if one person is elevated from the herd.