Eye witness testimony is crap too. Even if you could answer pointed questions about your whereabouts in any given evening using Google maps, human recollection of events and their details is not great.

There are questions I am capable of answering with the police but I must accept that most questions I answer could be wrong, or another witness could be wrong and now the police can use my evidence to accuse me off being a liar... Which happens to innocent people in the US because our prison system isn't about Justice, it's about maximizing the slave count in the private prison system.