No, if you test loads of symptom free people multiple times you are going to create loads of false positives.

Certainly at my sister's office they've had more people test positive with no symptoms, not having mixed with anyone outside their bubble or worked closely with anyone, not had anyone in their bubble test positive, etc than people test positive and then develop symptoms or spread it.

However the fact two of them have tested positive at the same time would put the likeliness of a false positive down a bit, unless the kits themselves got contaminated that day.

I don't know how many of you have had a covid test but it's so uncomfortable and annoying it's hard to do it in a clean way. When I did the nose part I basically did a massive sneeze over the whole car so if I'd had it done in a room with someone else everything would have been covered in my viruses.