LOL
oh shatner you just made me laugh. there isnt' any 'real' evidence for anyone. That's the whole point.
Actually he was found standing over the body, and had blood on his clothes (this was not questioned because he worked on a meat cart so it could be nowt to do with the body but equally could be a convenient cover). He then lied about his name to the police. Also, the locations of the murders all neatly fitted the route he walked from home to work at roughly times in which he walked the route, except for one which happened on his day off and was on the route from his mother's house to his home.
BUT like I said, it's alllllllll circumstantial and none of it is REAL evidence against anyone hence why they couldn't arrest anyone at the time. The case against Kosminski is literally that he was put in an insane assylum, that's it. As I said it's just my personal favourite in the case.
Lechmere wasn't always my favourite suspect, but I helped a writer friend who was doing some very detailed research and through that decided that almost everyone else I had considered at one time or other was actually just a random accusation by people long after the incident with spurious 'facts' linking them to the area. Going by people actually mentioned in the original case notes for me Lechmere is the most convincing suspect (despite not being considered a suspect at the time). That doesn't mean I AM convinced. but it's the best of a bad bunch.
There is basically nothing which policemen would consider to be reliable evidence in the case at all, police practices were not as slick and the lack of cooperation between the city police and the Met police didn't help matters either. the media hype around the incident led to the police being inundated by false admissions, false witness statements and all sort of other crap because people wanted to 'get in on it'. It was impossible for them to solve it then and it still is now.
As a PP said IF the same crimes in the same way were committed now, that's a different matter. but also as a PP said the perpetrator now would more than likely be far more careful as they too would be aware of modern policing methods.