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Table 2 Publication details and methods used in the 34 network studies on drug trafficking organizations

From: Drug supply networks: a systematic review of the organizational structure of illicit drug trade

Description of methods Percent
Study focus
 Case study—group focus 41.2
 Case study—distribution chain 35.3
 Population/data mining 17.6
 Egonet distribution chain 2.9
 Multiple types 2.9
Coverage
 Canada or US 45.5
 Spain, Italy, or Greece 24.2
 Australia 12.1
 Colombia or Mexico 9.0
 UK or the Netherlands 9.0
Drug Market
 Multiple (includes cocaine) 48.4
 Cocaine 27.3
 Methamphetamine 15.2
 Cannabis 6.1
 Heroin 3.0
Group type
 Independent (no formal designation) 38.2
 Mafia or cartel 23.5
 Assorted (mixed) 23.5
 Street gang 8.9
 Outlaw motorcycle gang 5.9
Publication date
 2000–2009 29.4
 2010–2015 70.6
Research aim
 Exploring research questions 47.1
 Descriptive 35.3
 Testing formal hypotheses 11.8
 Disruption simulation/assessment 5.9
Level of statistical analysis
 Low (descriptive only) 47.1
 Medium (e.g., simple hypotheses tests) 41.2
 High (e.g., advanced simulation, multivariate analysis) 11.8
Analytic framework
 Cross-sectional analysis 79.4
 Dynamic analysis 20.6
Primary data source
 Police intelligence/investigative files 76.5
 Court records/transcripts of evidence 14.7
 Books (investigative journalism, auto-biography) 5.9
 Customs seizures 2.9
Funding
 None specified 79.4
 Federal grant 11.8
 Private or university-based 8.8
Publication venue
 Peer review journal article 82.4
 Chapter 14.7
 Conference paper 2.9