I have a couple of questions about the new generation scanners:
1. These new scanners are supposed to facilitate screening of hand luggage People don't need to remove electronic devices or liquids. In some airports, the liquid limit has been removed. The new scanners seem to give a lot of false positives in the UK though. I haven't noticed the same issue in non-UK airports where the new scanners have already been installed. There are huge queues on additional luggage screening in the UK. In Edinburgh, once I was at the airport and noticed that like 2 out of 3 pieces of luggage were waiting for manual screening. There was a huge queue. In Rome, if you have a bottle of wine for example, the new scanner recognises the type of liquid, and the bag goes straight through. In the UK, it gets sent for additional screening. What's the point of having new scanners if you send any bag with a bottle of wine/beer etc for secondary screening? Anything seems to be flagged as suspicious.

2. When it comes to the new scanners, is there a person reviewing images and making a final decision whether to send something for secondary/additional screening (manual check)? This could explain why in the UK there are so many bags that undergo additional screening. It's probably about the instructions given.