"Moral certainty" refers to having a strong belief or conviction about what is morally right or wrong without any doubts. It implies being completely sure and unwavering in one's moral judgment or understanding. Full definition
The third and ostensibly most serious objection is that biological experiments can not provide moral certainty. (firstthings.com)
Surely, as physicians, Burke and Pullicino would not insist that the entire field of medicine must be abandoned because there are no biological experiments that prove with moral certainty the doctor will «do no harm» in administering a potentially fatal drug to a patient. (firstthings.com)
As we say in our introduction «Science is increasingly expected to provide moral certainty in morally uncertain times» and «Environmental concerns are serving to provide direction for directionless politics.» (climate-resistance.org)