Could have an entire floor of danger that requires a breath test on the door to check that you are below, say, 35 µg of alcohol. Make the conference last a fort

Could have an entire floor of danger that requires a breath test on the door to check that you are below, say, 35 µg of alcohol. Make the conference last a fortnight and there is then plenty of time for people to sober up for accessing certain areas containing heavy engineering.