RFID Edge Capture eliminates the problem of over-scanning RFID tags from a phased-array RFID scanner by defining and calibrating a Capture Zone, defining an Ingress Line, and compiling Movement Events of collections of Item tags transiting the Capture Zone as aggregated by a Thresholding Algorithm. The Capture Zone may be defined by placing three or more specially designated Calibrator tags at vertices of the Capture Zone and then determining the locations of the Calibrators during a Calibration Mode. The Ingress line may be determined as a straight line between two designated Calibrators. Movement Events may be stored in a database for persistence and may be typed as ingress or egress based upon the direction of movement. Loiterers (stationary tags near a capture zone) and Drive-bys (tags that move past the Capture Zone but do not ingress or egress) may be eliminated from the data.