Again you can see the scanning being done against you. If it is cargo scanner. Nobody is “afk” at gate with ship fit scanner and surely nobody has a bot capable of flying around whole region, warping to belts and anomalies and fit scanning ships over and over until he gets whole fit and then sending it into chat channel.
So, if you want to see whether he scans you again when he already scanned you, then you need to learn how to find out you are being scanned which is visible and thus possible without game telling you automatically. But I wouldn’t call that a definite proof although it would be definitely good to know and use with other proofs you can get. And the bot might be smart coded enough to not scan you again anyway if you jump gate out and in again - so inconclusive.
There, here is an example of how to identify a bots. Hope it gives you some ideas.