For a fingerprint, if it is found on the murder weapon, then its evidentiary value is definitely top-notch, essentially locking down the criminal suspect. But if it's only found on the murderer's means of transport, then its evidentiary value is second-class, and then at the crime scene, if it's a public space like a coffee shop, where numerous fingerprints can be lifted, external conditions are needed to determine which fingerprint belongs to the criminal suspect.
In fact, DNA is much the same. Why do police love finding semen so much, and why did Chief Medical Examiner Niu become so familiar with the nature of toilet paper? It's because normal people don't just leave semen everywhere, and when it's found, its evidentiary strength is very strong.
