I would say “No”, but we may not have the means to uncover the truth. For instance, the sources of communicable diseases are bacteria and viruses- this is the truth. But for thousands of years, people did not know this- nor was there any evidence that was discernible.
Evidence may be there- but we are unable to know it. There may be intelligent life and human like beings in galaxies far, far away, and tons of evidence. We can’t know the truth about it, yet.