It's all tradeoffs, but "his blood was found on the murder weapon" wouldn't be sufficient for me - some childhood enemy could easily have planted a bunch of forensic evidence next to a crime scene.
After all, if my next door neighbour barged into my house and beat me up, the only evidence would be my visible injuries and my statement that it was my neighbour.
I'm not sure if I'd prefer a society where he would be convicted, or where he wouldn't.
Considering that possibility, I don't want to put your neighbour in prison.
While I admire your devotion to Blackstone's Ratio, this doesn't seem like a recipe for stability and rule of law to me.
That is depending on your threshold of certainty. 1% is not that high considering that, according to the OJJDP, 5 milion people were arrested for serious charges in 2019 so with a 1% false positive rate that would be 100,000 people falsely imprisoned every year.
It does not have to be and really can't be 0% but 1% is unreasonably high in my opinion. If it can't be helped then it can't be helped but that isn't necessarily the case with these devices.