In a groundbreaking Indiana case, forensic scientists used an unconventional form of evidence, known as the “scent of death,” to help convict a Michigan City man of murder. John Hallett, who was sentenced to 65 years in prison, was linked to the crime through chemical compounds associated with body decomposition, detected on the concrete floor of his basement where he had killed and concealed his roommate’s remains.

The case brought forensic expertise from Indiana University Indianapolis into the spotlight. Led by Professor John Goodpaster, an expert in forensic chemistry, the team utilised gas chromatography-mass spectrometry (GC-MS) to test for decomposition-related carboxylic acids on concrete fragments from Hallett’s basement. These acids, often linked to decomposition, were detected despite years passing since the crime and no remaining scent, likely preserved by layers of paint. This analysis provided police with the scientific proof they needed to confirm decomposition had occurred at the scene.

While this type of evidence, based on chemical traces left by decomposing bodies, has been used in high-profile cases like the Casey Anthony trial, it had yet to be admitted in Indiana courts. To secure its admissibility, Goodpaster’s team underwent a rigorous Daubert hearing to validate the reliability of this method. With the court’s ruling in their favour, Hallett’s case set a precedent for the use of “scent of death” forensic evidence in Indiana.

IU Indianapolis Forensics Program

The Indiana University Indianapolis Forensic and Investigative Sciences program, Indiana’s only accredited forensic science program, has been instrumental in supporting state law enforcement with cutting-edge research. Faculty members collaborate with law enforcement on a range of projects, from genetic profiling for cold cases to chemical analysis techniques used at crime scenes. The program prepares both undergraduate and graduate students for careers in high-level forensic roles, including positions in agencies like the FBI and forensic labs nationwide.

Republished courtesy of Indiana University. Note content has been edited. 

Original authors: Jaleesa Elliot