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 and a transmit coil spaced between said receive coils , said coils being shaped for receiving waste therethrough adjacent to the opening of the medical waste container ; and a controller in electrical communication with said coils , 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 such that said receive coils each generate a receive signal received by said controller ; wherein said controller is configured to generate a waveform based on both of said receive signals , 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 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 and a transmit coil spaced between said receive coils , said coils being shaped for receiving waste therethrough adjacent to the opening of the medical waste container ; and a controller in electrical communication with said coils , 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 such that said receive coils each generate a receive signal received by said controller ; wherein said controller is configured to generate a waveform based on both of said receive signals , 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 based on said waveform exceeding said first detection threshold at a first time and exceeding said second detection threshold at a subsequent second time . <EOS>