I keep thinking back on the Clutter Family murders, committed Nov 15, 1959 by Perry Smith and Dick Hickok. A family of 4 innocent people murdered by total strangers in a home burglary gone bad. It was the subject of the book and movie “In Cold Blood”.
Police were able to convict Smith and Hickok based on a shoeprint in the victim’s blood and a confession in which Perry Smith accused Hickok of taking part in the shooting. No other evidence connected them to the shooting, yet both eventually confessed, were tried, convicted and executed.
That was sufficient evidence, back when a confession and testimony against an accomplice meant something. All the evidence was circumstantial. The jury wouldn’t have dreamed of setting free killers because they didn’t think a confession and testimony against an accomplice was enough.
Today some folks insist on DNA or nothing, a ridiculously high standard.
en.wikipedia.org