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Title Study of the Transport of Odorants from Illicit Substances Using Direct Analysis in Real Time Mass Spectrometry
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Publication Date
Degree PhD
Discipline/Department Chemistry
Degree Level doctoral
University/Publisher Florida International University
Abstract Canines have been employed in matters of law enforcement because of their keen sense of smell. Presently, law enforcement officials are utilizing trained canines in routine traffic stops to assess if the vehicle contains any illicit substances. Many believe that this is an infringement on an individual’s fourth amendment rights, which has garnered the attention of both the media and the courts. Many questions have been raised with respect to canines alerting to locations where illicit substances were no longer present. Thus, the purpose of this dissertation research is to evaluate the manner in which active odorants transport and persist onto various substrates. Direct Analysis in Real Time (DART) coupled to an accurate-mass time-of-flight (AccuTOF™) mass spectrometer was used to rapidly analyze the volatile organic compounds (VOC’s) from a variety of narcotic and explosive substances. The DART ion source is a soft ionization technique used in ambient conditions to sample liquids, solids or gases in real time. Thermal desorption of the VOC’s could thus be conducted in seconds. The present study found that the VOC’s from illicit substances transport from one location to another, in a short amount of time, through a process known as advection, which may contribute to canines producing unconfirmed alerts during their training and certifications. Three of the four odorants used in this study produced positive results, with the exception being 2-ethyl-1-hexanol, as it was not detected at any time when held at distances between 0.5 and 3 meters. In addition, the amount of time needed for an active odorant to contaminate an object in its immediate vicinity was explored and the results were determined to be inconclusive. Although they were observed following longer exposure times, it was still deemed to be inconclusive since it was still possible for these odorants to be present, albeit not in detectable amounts, at lower exposure times. Controlled odor mimic permeating systems (COMPS), patented technology by IFRI were tested to determine the possibility of cross-contamination between the training aids, and the results conclude that there was not any evidence of cross-contamination observed during any of the trials.
Subjects/Keywords Direct analysis in real time; forensic science; canine; volatile organic compounds; odor; controlled odor mimic permeation systems
Contributors Kenneth G. Furton; Michelle Peace; Yong Cai; Alexander Mebel; Stewart D'Alessio
Country of Publication us
Record ID oai:digitalcommons.fiu.edu:etd-4305
Repository fiu
Date Retrieved
Date Indexed 2020-01-06
Created Date 2017-06-29 07:00:00

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…ABSTRACT OF THE DISSERTATION STUDY OF THE TRANSPORT OF ODORANTS FROM ILLICIT SUBSTANCES USING DIRECT ANALYSIS IN REAL TIME MASS SPECTROMETRY by Torki A. Zughaibi Florida International University, 2017 Miami, Florida Professor Kenneth G. Furton…

…way active odorants transport and persist. The International Forensic Research Institute (IFRI) at Florida International University (FIU) has a patent on a training-aid kit known as Controlled Odor Mimic Permeation Systems (…

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