scatology: (medicine) the chemical analysis of excrement (for medical diagnosis or for paleontological purposes)
chemical analysis: the act of decomposing a substance into its constituent elements
serratia marcescens: the type species of the genus Serratia; a species found in water and soil and milk and foods and insects; can cause infections of the endocardium and blood and wounds and urinary tract and respiratory tract; has been tested as a bioweapon