There was a show on TV quite a few years ago. They picked 3 top rated investigators from the FBI, Interpol and I think, Scotland Yard.
None of them had studied the case before. They were presented with all the known facts and were told to write their opinion down. At the end, they presented the answers.
All three had chosen the Polish guy as the guilty one.
Now, THAT’s cool. Their investigations arrived at the true culprit without DNA.