We cannot be held to what is beyond our strength and means; for at times the accomplishment and execution may not be in our power, and indeed there is nothing really in our own power except the will: on this are necessarily based and founded all the principles that regulate the duty of man.
Doing a background check is still a very manual process, because the government agencies that create the records are largely paper-based systems. I'm not going to deny that there are errors, because in any system that involves human beings or technology, there are going to be errors.