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Related Experiment Videos

Postmortem microscopic changes observed at the human head hair proximal end.

C A Linch1, J A Prahlow

  • 1Division of Forensic Science, Richmond, VA 23218, USA.

Journal of Forensic Sciences
|February 24, 2001
PubMed
Summary

The common "postmortem root band" in decomposing hair is rare. This study identified four types of hair root decomposition, finding no link between time of death and decomposition rate.

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Human hair histogenesis for the mitochondrial DNA forensic scientist.

Journal of forensic sciences·2001

Area of Science:

  • Forensic Science
  • Human Decomposition Studies
  • Hair Analysis

Background:

  • Existing literature predominantly describes two types of human hair roots from decomposing scalps.
  • The common representation of decomposing hair roots includes a postmortem dark root band.
  • This band is frequently cited in published photomicrographs as a key indicator.

Purpose of the Study:

  • To investigate the actual prevalence and types of postmortem changes in human scalp hair proximal ends.
  • To determine if a correlation exists between the time of death and the rate of hair root decomposition.
  • To challenge the established representation of decomposing hair roots in forensic literature.

Main Methods:

  • Review of 22 cases with reliable time of death documentation from medical investigator reports.

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  • Microscopic examination of human hair proximal ends from decomposing scalps.
  • Categorization of observed postmortem changes in hair roots.

    • Main Results:

    • The most common postmortem change in hair proximal ends does not include the postmortem dark root band.
    • Four primary types of postmortem changes in hair proximal ends were identified.
    • No statistically significant correlation was found between the time of death and scalp hair proximal end decomposition.

    Conclusions:

    • The widely accepted postmortem dark root band is not the most common indicator of hair root decomposition.
    • Scalp hair roots exhibit diverse decomposition patterns independent of the time since death.
    • Evidence suggests hair roots may resist decomposition even after removal from the scalp.