A security firm that sells weapons scanners costing $3.7 million to U.S schools is facing questions after its technology failed to detect a large number of knives in a report, including two used in recent stabbings by students in Ohio and New York.Evolv Technology was found to have failed to detect 42 percent of large knives in 24 walk-throughs, according to . The systems, which are used in hundreds of schools across the country, use sensor technology that uses low-frequency waves to induce magnetization in metal objects passing through.
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