Back in January, I wrote one of my most popular posts ever: “Why you don’t need an RFID-blocking wallet.” As the title suggests, I argued that it’s a waste of money to buy a wallet with special shielding to protect your chipped credit card from RFID scanners wielded by street criminals seeking to snatch your credit card number.

Since then, in true internet tradition, I’ve been called an idiot by dozens of people and received emails from RFID vendors saying I’m a disgrace—the latter begging me to tell people they also need a Faraday bag for their cellphones. (Tip: If you don’t want anyone tracking you via GPS, turn off your cellphone’s GPS feature.) I’ve also been emailed by people who are 100 percent sure, without any real evidence, that they were the victims of RFID-scanning criminals.

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