The government is considering installing X-ray cameras on lampposts that can see through clothes to help spot armed terrorists and criminals.
According to a leaked memo seen by The Sun newspaper, "detection of weapons and explosives will become easier" if the scheme is adopted.
The document was produced by Home Office officials, who, in the document, acknowledge the scheme would be controversial.
"The social acceptability of routine intrusive detection measures and the operational response required in the event of an alarm are likely to be limiting factors," officials say in the document.
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The memo is dated 17 January, and was drawn up for the prime minister's working group on security, crime and justice, said The Sun.
The Home Office has refused to comment on the leaked document.
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