Processing apparatus, processing method, and non-transitory storage medium

A processing method comprising,

• by a processing system:
• capturing an image of a person passing through a first area and generating a person image indicating an appearance of the person;
• emitting an electromagnetic wave having a wavelength of 30 micrometers or more and 1 meter or less toward the person passing through the first area, and receiving a reflected wave;
• determining whether the person possesses a pre-designated object, based on a feature value appearing in a signal of the received reflected wave without generating a transmission image based on the signal of the received reflected wave;
• and
• registering, in a first list, the person image of the person determined to possess the pre-designated object.

A non-transitory storage medium storing a program that causes a computer of a processing system to:

• capture an image of a person passing through a first area and generate a person image indicating an appearance of the person;
• determine whether the person possesses a pre-designated object, based on a feature value appearing in a signal of a reflected wave of an electromagnetic wave having a wavelength of 30 micrometers or more and 1 meter or less and being emitted toward the person passing through the first area without generating a transmission image based on the signal of the received reflected wave;
• and
• register, in a first list, the person image indicating an appearance of the person determined to possess the pre-designated object and being generated by capturing an image of the person passing through the first area.