As soon as I saw keyless cars entry I knew how the criminals would bypass the false security. 2 Radios. You can buy pockets for the "keys".

As as soon as I saw contactless credit cards with my name on, I got a metalised pouch for each.

I don't think it needed my studying radio comms at uni to figure it out. But when I told people how a card could be read at a distance (1 metre predicted) they thought I was fanciful because they had been told by the banks. But at, say, a night club, people jossling, inedbriated, would you remember what drinks were ordered?

And the banks underwrite losses! Because the savings in not investigating outweighed the rarity of complaints.