I get that its the proof that they are struggling with.
I guess I went off on a tangent but my question was meant to be .. how can in 2019 a body just disappear with no forensic evidence? He is a petty criminal, he isn't a mastermind and I would think that you would have to be incredibly smart and also have the crime be premeditated to leave no forensic evidence. Especially in the dark.
*if he had moved her body from the park using his car then surely there would be dna/blood/scent etc which there doesn't seem to be.
*if she was left in the park then surely they would find something by now. I doubt in them cold, icy conditions that the water wouldn't have taken her far.
How can someone be smarter than forensics and have gotten away with it in 2019 under the circumstances of which it seems to have happened (he took her at 12.09 and drove her to the park, potentially then drove home until work the next morning, hense the small search area).