A system and associated method for analyzing a smoking article filter is provided. An emitter emits an initial signal toward a smoking article filter. The initial signal may have a frequency between about 0.1 teraHertz and about 10 teraHertz. A sensor may detect a resultant signal resulting from interaction of the initial signal with the smoking article filter. An analysis unit may receive the resultant signal from the sensor, determine a filter status based on the resultant signal, and output an indicium indicative of the filter status. The filter status may include a capsule presence within the smoking article filter, a capsule absence from the smoking article filter, a proper insertion of a capsule into the smoking article filter, a defective insertion of a capsule into the smoking article filter, a proper capsule within the smoking article filter, and a defective capsule within the smoking article filter.