Vadum has developed a new class of detection system that can detect the presence of radio transceivers (e.g. mobile phones) whether they are powered on, powered off, or even if the battery has been removed. This sensor detects the unique RF signature of the transceiver, similar in concept to radar detecting the signature of an airplane. The portal technology demonstrated under SBIR funding has the capability to rapidly and unobtrusively scan individuals entering a facility or moving through a constrained area (hallway, doorway. etc.) to determine if they possess a wireless device. The Vadum sensor provides a game-changing capability for military, civilian, and law enforcement physical security.