At what point does evidence establish truth?
For myself, I usually consider something as a possibility when there is a reasonable suspicion that it could exist (kinda redundant I guess).
I usually will refer to something as true when there is slightly more evidence in its favor than for the other alternative. I don't mind a low burden of proof because I feel that truth is relative anyway.
However, if someone else only considers something true when evidence is beyond a reasonable doubt, then there idea of verifiable evidence will differ.