What counts as "signs of life"? I think the best case scenario for them is to find some biosignatures, i.e. some chemical substances which are normally on Earth produced by life. This is far from a direct evidence for life. Will it count as a YES for this question?

What if someone other than NASA finds signs?

@NoUsernameSelected Then it's not NASA so doesn't count. Unless NASA is also involved, in which case it counts. does that seem fair?