They clone cards. They do this quickly hoping to get as much as possible before the card is shut down.There is an area here where a lot of people go to cycle and jog. The parking log is a known target for thieves. One day my wife put her purse in the trunk of her car before pulling out of our garage.
She went to this spot, had a jog then drove home. When she opened her trunk the purse was gone. Not a scratch or mark on the car. The cops told her that the thieves have electronic devices that open car doors and trunks that can be opened with a remote.
Sound professional to me. In the hour before she discovered the theft and called our credit card company and bank they already ran up a lot of charges at various Bay Area locations. More than one person must have had her cards.