Re: really...
"Without knowing the details, would it have been negligence if they were following a printed protocol exactly and it didn't tell them to double check the maths, and check the scales calibration and a host of other things?"
1) "I was following orders" is not a defence for negligence (or incompetence or stupidity).
2) If the study didn't have the correct procedures in place, then the leaders, approvers and implementors of the study would be guilty of negligence.