The importance of wavelength selection in on-scene identification of drugs of abuse with portable near-infrared spectroscopy

Both the increasing volume and diversity of drugs-of-abuse encountered by investigation services necessitates need for fast on-scene detectors to detect identify a broad range substances. Near-Infrared (NIR) spectroscopy is suitable presumptive drugs testing miniaturized sensors implemented in portable devices. Currently, myriad different NIR spectrometers available that utilize wavelength ranges. This study presents comparison spectra frequently occuring analyzed five A 350 – 2500 nm laboratory grade VIS-NIR spectrometer was used gain insight spectral ranges diagnostic substances relevant forensic science. Obtained were compared output operating 740 1070 nm, 950 1650 1550 1950 1300 2600 range. The results yielded novel insights usability individual visual inspection as well comparative statistics with reference For MDMA detection, an instrument capable detecting highly abundant specific peak at 2020 beneficial whereas colored samples are more difficult lower sensors. Relatively pure, lightly may be correctly characterized all These findings aid selection practice future studies on selectivity or cross-platform calibration transfer.