Scotland Yard is considering trials of scanners which can detect hidden weapons in public places.
The Met says it is liaising with a private security firm over testing the technology as a means of tackling violent crime.
Police said they were considering trials of the “scanning software” as Tory mayoral candidate Shaun Bailey pledged to deploy £800,000 scanners if he was elected.
He said one company, Thermal Matrix, had scanners being used by law enforcement in the United States and Indonesia.
The technology uses thermal-imaging cameras and software to detect concealed weapons and Mr Bailey said they could be deployed to scan large crowds at events.
He said: “Technology alone won’t solve the crime epidemic that is threatening London but it can and must be part of the solution.”
Mr Bailey claimed he would fund the technology — plus 2,000 extra officers — by cutting “the irresponsible waste at City Hall”.
His comments come weeks after the Government announced plans to fund the development of scanners to check crowds for weapons and alert police.
A Met spokeswoman said it was liaising with a company over “scanning software for use in public spaces as a preventative measure in regards to violent crime”.