Problems of Forensic Sciences 2009 Vol. 79 (LXXIX) 255-267
DETERMINATION OF OPTIMAL ORDER OF PERFORMANCE OF FINGERPRINT AND SPEECH AND AUDIO ANALYSIS ON MAGNETIC TAPES
Jerzy BRZOZOWSKI, Mateusz KAJSTURA
Institute of Forensic Research, Krakow, Poland
Streszczenie
If it is necessary to carry out fingerprint examination and speech and audio or video analysis on the same tape then a decision should be made as to which procedure should be performed first in order to avoid a loss of important information. The following experiments were performed within the presented research: analysis of efficiency of fingerprint development on a magnetic tape by application of standard fingerprint development methods, analysis of the influence of application of these methods on magnetic tape features, analysis of effects of friction between reading heads and tape surface on left fingerprints. It was observed that application of the cyanoacrylate method and contrast agent Ardrox to fingerprint development did not give better results than the visual method and at the same time could make recording analysis impossible. Fingerprints of insufficient quality, if they are fresh, can be enhanced by application of latent print powders. Performance of video and especially speech and audio analysis before fingerprint examination could cause degradation of fingerprints which were left on the magnetic surface of a tape, during friction (rubbing) of video heads on the magnetic surface of a tape.
Słowa kluczowe
Magnetic tapes; Order of analysis; Fingerprint examination; Speech and audio or video analysis.