Dh works in the medical laboratory field
His lab operate a standby system whereby if the person doing an out of hours shift requires extra help due to system problems etc, the standby person has to come in - which is fair enough as sometimes it is too much for one person to cope with
However, on days where DH (and all the other staff when it is their turn for a standby) has done a full, normal days work and is on standby, if he/she is required to come in, it means they have worked the whole day and potentially all of the night - depending how early they get called in and how late in they need to stay
Surely this cannot be allowed? How can you safely work with results if you have such minimal sleep? What would be the legal ramifications if such a worker made a genuine error due to sheer tiredness, through no fault of their own, that had serious implications?