  Forensic speaker identification has traditionally considered approaches based
on long term spectra analysis as especially robust, given that they work well
for short recordings, are not sensitive to changes in the intensity of the
sample, and continue to function in the presence of noise and limited passband.
We find, however, that anger induces a significant distortion of the acoustic
signal for long term spectra analysis purposes. Even moderate anger offsets
speaker identification results by 33% in the direction of a different speaker
altogether. Thus, caution should be exercised when applying this tool.
