TEL AVIV — Companies from Israel and the United States have been working on joint development of non-intrusive systems to inspect airline passengers.

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"You only want to detect the substances from which you can make explosives or biological agents," Sela said.

TraceGuard has been developed by Israel's Trace-Safe as well as the American firm Raptor. The system was designed to ignore benign substances and prevent against false alarms.

Sela, a consultant to Western and Asian governments, said TraceGuard could eliminate the use of body and shoe scanners at U.S. and other Western airports. But, in an interview with the Israeli website Israel21c, Sela acknowledged that Trace-Safe faces a struggle in persuading airport authorities to revise their security methods.

"I am among those experts who believe the full body scans are wrong and not healthy for people," Sela said. "Especially since they are passing through radiation; it defeats the cause."

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