yeah, forensic techniques have advanced somewhat since 1985
That's very very true, but each generation falls into the trap of believing they are so much better than the last generation, which is usually true, but invites complacency too... the same complacency that occurred in this tragedy.
The police at the time DID do a lot of things well, and they went to great effort to document things, photograph them etc. All of that said, their documentation now seems ambiguous in places, contradictory in others and still there's question marks about certain photos etc etc. (even though it was probably 10 times more complete than the generation before).
I can't tell you how many times I've heard the phrase "that couldn't happen today" - The moment that phrase is used, it means it CAN happen again.
I'm of the belief the police didn't do anything to frame Bamber, but that their initial assumption of suicide (which was understandable) led to a HUGE problem in gathering evidence over a month later. Basically, that assumption caused a lot of evidence to be destroyed and afford JB a lot of time to cover tracks (if he did it).
25 years on, we are now looking at the logs and picking holes in discrepancies (which are normal), and reading an awful lot into small phrases. If you believe JB to be innocent, there's a fair amount of stuff that can cast doubt on some events, if you believe JB's guilty, then there's little to really prove otherwise. So to my mind, there's nothing to prove his innocence, just enough to suggest it was possibly not him.
As the law puts it, you must ascertain 'beyond reasonable doubt' that it was him. So far, from what I've read, there is reasonable doubt over some aspects, but I would also say much of it is "beyond reasonable". We're also not privy to ALL the information and facts.
This crime really does make for a fascinating one. So much mess in the family, it's almost Miss Marple like! You couldn't write a book of this story without people calling it far fetched.
The one this I DO know - the entire family were not 'typical'!