Hi everyone, my first post here, thanks for having me 
So I am a big listener to crime podcasts such as Sword and Scale, Criminal and SinisterStream.
Having listened to sinister streams latest episode about the yorkshire ripper (link) it kind of got me wondering, he was interviewed like 9 times and there was lots of evidence left at each scene. Was DNA and investigative techniques so poor back then as the 70s wasnt so long ago when you think about it?