A detection system for detecting disposal of metallic objects into an opening of a medical waste container, said detection system comprising: a detection indicator for indicating passage of metallic objects through the opening of the medical waste container; a pair of receive coils (52, 54) and a transmit coil spaced between said receive coils (52, 54), said coils (52, 54, 56) being shaped for receiving waste therethrough adjacent to the opening of the medical waste container; and a controller in electrical communication with said coils (52, 54, 56), wherein said controller is configured to generate a transmit signal and communicate said transmit signal to said transmit coil such that said transmit coil generates a magnetic field based on said transmit signal, wherein said magnetic field induces voltage in each of said receive coils (52, 54) such that said receive coils (52, 54) each generate a receive signal (62, 64) received by said controller; wherein said controller is configured to generate a waveform based on both of said receive signals (62, 64), wherein said waveform has a baseline condition corresponding to absence of interaction of metallic objects with said magnetic field; wherein said controller is configured to analyze said waveform with respect to a first detection threshold and a second detection threshold opposite to said first detection threshold with said baseline between said first detection threshold and said second detection threshold; and wherein said controller is configured to activate said detection indicator in response to metallic objects passing through said coils (52, 54, 56) based on said waveform exceeding said first detection threshold at a first time and exceeding said second detection threshold at a subsequent second time. a detection indicator for indicating passage of metallic objects through the opening of the medical waste container; a pair of receive coils (52, 54) and a transmit coil spaced between said receive coils (52, 54), said coils (52, 54, 56) being shaped for receiving waste therethrough adjacent to the opening of the medical waste container; and a controller in electrical communication with said coils (52, 54, 56), wherein said controller is configured to generate a transmit signal and communicate said transmit signal to said transmit coil such that said transmit coil generates a magnetic field based on said transmit signal, wherein said magnetic field induces voltage in each of said receive coils (52, 54) such that said receive coils (52, 54) each generate a receive signal (62, 64) received by said controller; wherein said controller is configured to generate a waveform based on both of said receive signals (62, 64), wherein said waveform has a baseline condition corresponding to absence of interaction of metallic objects with said magnetic field; wherein said controller is configured to analyze said waveform with respect to a first detection threshold and a second detection threshold opposite to said first detection threshold with said baseline between said first detection threshold and said second detection threshold; and wherein said controller is configured to activate said detection indicator in response to metallic objects passing through said coils (52, 54, 56) based on said waveform exceeding said first detection threshold at a first time and exceeding said second detection threshold at a subsequent second time.