The company I work for does investigate. Due to HIPAA, it's very challenging to do them as they can't divulge who has it. They take out anyone who came in within 6 feet for more than 15 minutes. I think the time and distance are rather arbitrary but it's what the CDC stipulates. I think door handles (which we sanitize), flat surfaces (work stations, machines), and other shared surfaces (vending, anywhere in the bathroom, etc) have far more potential for widespread transmission.
We have all the science to know this ***** but we choose to use antiquated thinking and methodology. Most because of politics. It's ugly.