I know it's how things are in US. Some stupid thing someone came up with in 1920 stuck there. Not sure if any other country on the planet has such a silly rule.
If evidence is false or tampered with then by all means ignore it, but if it's solid it doesn't matter if it came out just because someone committed some additional crime.
If evidence is false or tampered with then by all means ignore it, but if it's solid it doesn't matter if it came out just because someone committed some additional crime.