There are a lot fewer staff around than TV would have you believe. You would need basically 1-on-1 supervision until the drug wore off, which is very resource intensive compared to a one-time intervention.

I mean, is that not what they all did?

Put a thermometer in plain view and tape your phone number to the window as a backup in case someone is unable to see the thermometer, or your AC has malfunctioned and there is an actual issue.