Fingerprint pregnancy scanner online
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It is often the case that a suspect deposits latent fingerprints on the sticky side of adhesive tape material when tying up victims, manufacturing improvised explosive devices or packaging illegal goods. Zhang, Ning Wang, Chengming Sun, Zhenwen Li, Zhigang Xie, Lanchi Yan, Yuwen Xu, Lei Guo, Jingjing Huang, Wei Li, Zhihui Xue, Jing Liu, Huan Xu, XiaojingĪdhesive tape is one type of common item which can be encountered in criminal cases involving rape, murder, kidnapping and explosives. According to the special absorption, reflection, scattering and fluorescence characterization of the various residues in fingerprints (fatty acid ester, protein, and carbosylic acid salts etc) to the UV light to weaken or eliminate the background disturbance and increase the brightness contrast of fingerprints with the background, and using 266nm UV laser as excitation light source, fresh and old latent fingerprints on the surface of four types of non-absorbent objects as magazine cover, glass, back of cellphone, wood desktop paintwork and two types of absorbing objects as manila envelope, notebook paper were noninvasive detected and appeared through reflection photography and fluorescence photography technologies, and the results meet the fingerprint identification requirements in forensic science.ĭetection of latent fingerprint hidden beneath adhesive tape by optical coherence tomography. Unprocessed latent fingerprints were developed on various non-absorbent and absorbing substrates. The capability of photography technologies using 266nm UV Nd:YAG solid state laser as excitation light source to provide detailed images of unprocessed latent fingerprints is demonstrated. Latent fingerprints present a considerable challenge in forensics, and noninvasive procedure that captures a digital image of the latent fingerprints is significant in the field of criminal investigation. Li, Hong-xia Cao, Jing Niu, Jie-qing Huang, Yun-gang Mao, Lin-jie Chen, Jing-rong Study of noninvasive detection of latent fingerprints using UV laser
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The most difficult aspect of the detection of these substances in latent fingerprints was visually locating the substance in the fingerprint in order to obtain a Raman spectrum. These bands did not prevent identification of the substances and could be successfully removed by spectral subtraction. Interfering Raman bands arising from latent fingerprint material were present in the spectra obtained from the substances in sebum-rich fingerprints. Raman spectra obtained from the substances in sweat-rich latent fingerprints were of a similar quality to spectra that obtained from the substances under normal sampling conditions. Photobleaching was necessary to reduce the fluorescence background in the spectra of some substances. The substances studied could be clearly distinguished using their Raman spectra and were all successfully detected in latent fingerprints. Five drugs of abuse (codeine phosphate, cocaine hydrochloride, amphetamine sulphate, barbital and nitrazepam) and five non-controlled substances of similar appearance, which may be used in the adulteration of drugs of abuse (caffeine, aspirin, paracetamol, starch and talc), were studied in both sweat-rich and sebum-rich latent fingerprints. The scenario considered was that of an individual handling a substance and subsequently depositing a contaminated fingerprint. This paper describes the application of Raman spectroscopy to the detection of exogenous substances in latent fingerprints.
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The detection of drugs of abuse in fingerprints using Raman spectroscopy I: latent fingerprintsĭay, Joanna S.