Tracking down dangerous, hidden materials typically requires either a substantial labor force, costly and specific tools, or both. But a group of researchers is exploring a way in which threatening objects hidden in boxes or bags can be detected using off-the-shelf Wi-Fi.

The researchers, which include engineers from Rutgers University–New Brunswick, Indiana University-Purdue University Indianapolis (IUPUI), and Binghamton University, published a study this month detailing a method in which common Wi-Fi can be used to easily and efficiently identify weapons, bombs, and explosive chemicals in public spaces that don’t typically have affordable screening options.

The researchers’ system uses channel state information (CSI) from run-of-the-mill Wi-Fi. It can first identify whether there are dangerous objects in baggage without having to physically rifle through it. It then determines what the material is and what the risk level is. The researchers tested the detection system using 15 different objects across three categories—metal, liquid, and non-dangerous—as well as with six bags and boxes across three categories—backpack or handbag, cardboard box, and a thick plastic bag.

The findings were pretty impressive. According to the researchers, their system is 99 percent accurate when it comes to identifying dangerous and non-dangerous objects. It is 97 percent accurate when determining whether the dangerous object is metal or liquid, the study says. When it comes to detecting suspicious objects in various bags, the system was over 95 percent accurate.

The researchers state in the paper that their detection system only needs a wifi device with two to three antennas, and can run on existing networks. “In large public areas, it’s hard to set up expensive screening infrastructure like what’s in airports,” Chen said. “Manpower is always needed to check bags, and we wanted to develop a complementary method to try to reduce manpower.”

belta.by