By Michael Grabell, ProPublica

Look for a PBS NewsHour story on X-ray body scanners, reported in conjunction with ProPublica, to air later this month.

On Sept. 23, 1998, a panel of radiation safety experts gathered at a Hilton hotel in Maryland to evaluate a new device that could detect hidden weapons and contraband. the machine, known as the Secure 1000, beamed X-rays at people to see underneath the ir clothing.