Photo-Skull Superimposition
Definition
The forensic identification method of placing a life portrait photograph alongside or overlaid on a photograph of a recovered skull, aligning them on shared anatomical landmarks, and assessing the consistency of bone structure with the facial features in the portrait. First used in court in the Buck Ruxton case (1936).
- Method
- Overlaying a life portrait on a skull photograph
- Basis
- Alignment on shared anatomical landmarks
- First court use
- Buck Ruxton case, 1936
- Purpose
- Assessing consistency between bone structure and facial features
Common questions
Does a consistent superimposition prove identity beyond doubt?+
No, it can support that a skull is consistent with a specific individual and exclude clearly inconsistent candidates, but it is generally treated as corroborative evidence alongside DNA, dental, or other identification methods rather than standalone proof.
What has replaced or supplemented photo-skull superimposition today?+
Digital video superimposition and 3D craniofacial reconstruction software now perform the same landmark-alignment comparison with greater precision and repeatability than the original manual photographic overlay technique.
Why was the Buck Ruxton case significant for this method?+
It was the first time superimposition evidence, comparing a victim's photograph to a recovered skull, was presented and accepted in a British court, establishing a precedent for the technique's use in identification testimony.
Related terms
- Consistent with
- The categorical superimposition conclusion that examined morphological features do not exclude the skull as deriving from the same individual as the portrait....
- Exclusion
- The categorical conclusion that one or more examined features are clearly inconsistent in a way that cannot be explained by projection angle,...
- Frankfurt Horizontal Plane
- The anatomical reference plane defined by the upper border of the external acoustic meatus and the lowest point of the orbital margin...
- Glaister-Brash Method
- The original photographic-transparency superimposition protocol developed by John Glaister Jr and James Couper Brash for the 1935 Buck Ruxton case in Lancaster...
- Gnathion
- The most inferior point of the mandibular symphysis in the midline, corresponding to the tip of the chin in the portrait photograph....
- Gonion
- The most posterior and inferior point of the mandibular angle, bilaterally. Used in superimposition to assess the width of the jaw angle...
- Iscan-Helmer 1993
- The edited volume 'Forensic Analysis of the Skull' (Iscan and Helmer, Wiley-Liss, 1993) that brought together the first systematic reliability assessment of...
- Nasion
- The anatomical landmark at the junction of the nasal bones and the frontal bone (the bridge of the nose). One of the...
- Video Superimposition
- The updated superimposition workflow using a motorised skull turntable, a calibrated video camera, and real-time electronic mixing of the skull video image...