When her mother refused to believe her, the girl left her webcam running all night, pointed at her bed.
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It was the first time in British legal history that evidence of this kind was presented in court proceedings.
Black explained her rationale, but conceded that she didn't have statistics showing the likelihood of the hands matching.
I could say no more than everything matched, and we couldn't say it definitely wasn't him," she says.
"Operation Ore was the first time I realised these kind of cases could have such a volume," she says.
According to Black, about a million images of child abuse are uploaded to the dark web every day. »