Hi there,
If the case was investigated it will show. Also, usually when something like this shows up the police will phone up whoever hs requested the check to inform them this will show on it so they don't slip under the net. He won't be working in any schools.
I hope this reassures you. Also, if by any fluke he did slip under the mat you would be completely within your rights to contact the organisation who'd tsken him on and make them aware that he has been investigated for this - you wouldn't need to say you are the victim, just that you know it happened. The school would have to suspend him and look into it.
Hugs.