Locard Exchange Principle
Whenever two objects come into contact with one another, there is exchange of materials between them.
A molecule consisting of many identical repeating unit; polymers can be naturally occurring or synthetic
The spongy interior core of hair that gives it flexibility; appears as a canal in the middle of the shaft.
A tough protein polymer made up of about 20 different amino acids. The principal one is cystine, which allows strong disulfate bonds to form between protein chains. This cross-linking makes hair so resistant to chemical and biological degradation. All that sulfur in Keratin also accounts for the distinctive smell of burning hair.
Patterns that demonstrate the wave nature of light, resulting from constructive(additive) and destructive combinations of light waves. This happens when a small object deflects coherent light so the wave fronts travel different directions. This phenomenon is called diffraction.
A natural pigment found in the skin. Ultraviolet rays in sunlight make it more concentrated, causing tanning
Term used in forensics to describe a sample of unknown origin; for example, a hair was found on a jacket, but we do not know whose head it came from.
Term used in forensics to describe a sample of known origin; for example, a hair was found on a jacket, but we do not know whose head it came from.