Forensic Analysis of Signatures, Handwritings & Digitally Manipulated Documents

FORENSIC DOCUMENT CASE EXAMPLES

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DETECTING ALTERATIONS IN DOCUMENTS USING
A VIDEO SPECTRAL COMPARATOR (VSC)

Ink Differentiation

Areas other than handwriting and hand printing identification are also considered in the examination of questioned documents. Ink differentiation is used to detect alterations, erasures, and material changes in documents. The physical and chemical properties of two different inks will cause differing results when examined using the alternative light sources and filtering techniques available with the VSC.

Detecting Erasures

Revealing Masked Information

Restoration of the original entry under infra-red luminescence conditions.

Detection of Overwriting’s

Restoration of the original entry under infra-red luminescence conditions.

DECIPHERMENT OF INTENDED WRITINGS USING OBLIQUE LIGHT AND ESDA

Oblique light photography

Oblique light, i.e. lighting at an angle, is applied to the surface of the paper to reveal any furrows of indented writing. A photograph is then taken of the shadowed indentation.

Using Electrostatic Detection Apparatus (ESDA)

Document Examiners at Forensicwriting & Questionedocument Services utilize the Electrostatic Detection apparatus techniques to decipher the intended writings.

DETECTING SEQUENCE OF STROKES USING STEREOMICROSCOPE

A stereomicroscope is used by our examiner to check whether the document was signed after the text was added to the sheet of paper or whether the document was signed before the text was added to the sheet of paper. The establishment of a sequence of two crossing strokes can be done which can disclose fraud in an altered and built-up document.

DIFFERENTIATING PAPER UNDER ULTRAVIOLET LAMPS

Different papers may give different fluorescence under Ultraviolet rays. This phenomenon can help to detect the substitution of pages in Agreements, Contracts, and Wills etc.