The claim is the old machines had issues with detecting and on the ground. First time I went through Heathrow after the incident. You had to take your shoes of

The claim is the old machines had issues with detecting and on the ground. First time I went through Heathrow after the incident. You had to take your shoes off and went to a separate machine. The shoes were scanned then you walked back... Plenty of time to put something back on the shoe.