They detect a possible Covid-19 infection by measuring electromagnetic waves, “which change when the [ribonucleic acid RNA] particles of the virus are present in the person’s body”.

RNA typically acts as a messenger carrying instructions from DNA.

How do the scanners work?

A reader is placed within five metres of the individuals set to be scanned.

Within seconds, the device analyses each face, and sends a message to the smart phone held by the operator.

Green means the subject has tested negative, a red reading indicates they have tested positive.

The EDE scanner is used alongside other devices, including thermal scanners

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