Monitor the operation for a while. It's not 100%, but will give you enough to be suspicious, and if it's repeated often enough, the chances of being right increases. That said, from your point of view, why is that contact different? You made it there and back. It's not like some topbanders that use a remote receiver closer to the target entity, and give the other station a false sense of accomplishment. Just asking... if a human on both sides of the contact is what you want, nothing wrong with that. I tend to focus on the RF part for the most part, the payload is secondary, or I would stick with a good old ragchew. My favorite question, for DXers at least, is: Is a P5, or Bouvet bot, acceptable? Let's be honest now. We already saw some of the 'True Blue DXers' relent to FT8, quietly.