Trends in Exam Cheating: Lentil-sized earpieces powered by cellphones used in United Arab Emirates

The device is commonly available in local shops for students. I first became aware of the device about a week ago. 

It is very sophisticated and virtually impossible to detect. Teachers in the UAE may be right. The only way to detect the device is by using a metal detector.
Other options for dealing with the device are cellphone detectors or Faraday cages.

–Dennis Maynes

The use of a Bluetooth earphone the size of a lentil is being used by students to cheat during exams, teachers have complained.
He added, “It has so many specifications to enable the student to cheat in the exam without fear of discovery, including high definition sound.”
Education officials fear the only way to catch students using these devices is to pass them through a metal detector.