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A comment on The NYPD Is Using Mobile X-Ray Vans to Spy on Unknown Targets. Parent comment

Re:The NYPD Is Using Mobile X-Ray Vans to Spy on Unknown Tar... by Retric on Tuesday October 20, 2015 @05:16PM (#10421862)
No, X-rays have different penetrating power based on frequency. There using a back-scatter approach as it's just one van which means very low penetrating power. https://en.wikipedia.org/wiki/Backscatter_X-ray
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