Why People With Brain Implants Are Afraid to Go Through Automatic Doors

“When you get an implant, they warn you about interference with devices like MRI machines. But they don’t warn you about Best Buy or Walmart,” says Gary Olhoeft. An FDA report (which you can read here) written way back in the year 2000 identified the problem of implant-interference from other devices:

The consequence of EMI [or electromagnetic interference] with medical devices may be only a transient ‘blip’ on a monitor, or it could be as serious as preventing an alarm from sounding or inappropriate device movement leading to patient injury or death. With the increasing use of sensitive electronics in devices, and the proliferation of sources of EM energy, there is heightened concern about EMI in many devices.

This problem is 'likely to grow in scope and scale unless we plan carefully," according to a Gizmodo article. Read more about the issue here.