Efficacy of drug detection by fully-trained police dogs varies by breed, training level, type of drug and search environment.

Some recent publications claim that the effectiveness of police canine drug detection is uncertain and likely minimal, and that the deterrent effect of dogs on drug users is low. It is also claimed that more scientific evidence is needed to demonstrate to what extent dogs actually detect drugs. The aim of this research was to assess experimentally, but in actual training and testing environments used by the Polish police, how effective dogs trained by the police were at illicit substance detection depending on factors such as type of drug, dog breed, dog experience with the searching site, and drug odor residuals. 68 Labrador retrievers, 61 German shepherds, 25 Terriers and 10 English Cocker Spaniels, of both sexes in each breed, were used. Altogether 1219 experimental searching tests were conducted. On average, hidden drug samples were indicated by dogs after 64s searching time, with 87.7% indications being correct and 5.3% being false. In 7.0% of trials dogs failed to find the drug sample within 10min. The ranking of drugs from the easiest to the most difficult to detect was: marijuana, hashish, amphetamine, cocaine, heroin. German shepherds were superior to other breeds in giving correct indications while Terriers showed relatively poor detection performance. Dogs were equally efficient at searching in well-known vs. unknown rooms with strange (i.e., non-target novelty) odors (83.2% correct indications), but they were less accurate when searching outside or inside cars (63.5% and 57.9% correct indications respectively). During police examination trials the dogs made more false alerts, fewer correct indications and searching time was longer compared to the final stage of the training. The drug odor may persist at a site for at least 48h. Our experiments do not confirm the recent reports, based on drug users' opinions, of low drug detection efficiency. Usefulness of drug detection dogs has been demonstrated here, even if their effectiveness may not be 100%, but different factors have to be taken into consideration to assure maximum effectiveness.

[1]  Lisa Lit,et al.  Evaluating Learning Tasks Commonly Applied in Detection Dog Training , 2009 .

[2]  Tadeusz Jezierski,et al.  INFORMATION-SEEKING BEHAVIOUR OF SNIFFER DOGS DURING MATCH-TO-SAMPLE TRAINING IN THE SCENT LINEUP , 2008 .

[3]  Shawn E Brooks,et al.  Ability of canine termite detectors to locate live termites and discriminate them from non-termite material. , 2003, Journal of economic entomology.

[4]  M. Dunn,et al.  The use of drug detection dogs in Sydney, Australia. , 2009, Drug and alcohol review.

[5]  N. Rooney,et al.  Attributes of specialist search dogs--a questionnaire survey of UK dog handlers and trainers. , 2004, Journal of forensic sciences.

[6]  L. J. Myers,et al.  The scientific foundation and efficacy of the use of canines as chemical detectors for explosives. , 2001, Talanta.

[7]  Chris Lennard,et al.  Biological organisms as volatile compound detectors: a review. , 2013, Forensic science international.

[8]  M. Tomasello,et al.  Do domestic dogs interpret pointing as a command? , 2012, Animal Cognition.

[9]  Francis Galibert,et al.  Olfactory receptor sequence polymorphism within and between breeds of dogs. , 2005, The Journal of heredity.

[10]  Alanna E Lasseter,et al.  Cadaver dog and handler team capabilities in the recovery of buried human remains in the southeastern United States. , 2003, Journal of forensic sciences.

[11]  D. Wells,et al.  How many footsteps do dogs need to determine the direction of an odour trail? , 2005, Chemical senses.

[12]  L. Paul Waggoner,et al.  Effects of extraneous odors on canine detection , 1998, Other Conferences.

[13]  W. Helton.  Canine Ergonomics: The Science of Working Dogs , 2009 .

[14]  K. Svartberg,et al.  Breed-typical behaviour in dogs—Historical remnants or recent constructs? , 2006 .

[15]  Gabriele Bammer,et al.  Are drug detection dogs and mass-media campaigns likely to be effective policy responses to psychostimulant use and related harm? Results from an agent-based simulation model. , 2012, The International journal on drug policy.

[16]  L. Paul Waggoner,et al.  Canine olfactory sensitivity to cocaine hydrochloride and methyl benzoate , 1997, Defense + Security Symposium.

[17]  P. Bennett,et al.  Breeding dogs for beauty and behaviour: Why scientists need to do more to develop valid and reliable behaviour assessments for dogs kept as companions , 2012 .

[18]  Ron Shamir,et al.  The canine olfactory subgenome. , 2004, Genomics.

[19]  R. Bruno,et al.  Drug detection dogs in Australia: more bark than bite? , 2012, Drug and alcohol review.

[20]  L. J. Myers,et al.  Effect of dietary fat source and exercise on odorant-detecting ability of canine athletes. , 2003, Research in veterinary science.

[21]  Gary S Settles,et al.  The fluid dynamics of canine olfaction: unique nasal airflow patterns as an explanation of macrosmia , 2010, Journal of The Royal Society Interface.

[22]  José Luis Gordillo,et al.  Perception Aptitude Improvement of an Odor Sensor: Model for a Biologically Inspired Nose , 2013, MCPR.

[23]  Ira R. Weiss,et al.  Issues and opportunities , 1988, DATB.

[24]  Kenneth G Furton,et al.  Detection of piperonal emitted from polymer controlled odor mimic permeation systems utilizing Canis familiaris and solid phase microextraction-ion mobility spectrometry. , 2010, Forensic science international.

[25]  Genetics of canine olfaction and receptor diversity , 2012, Mammalian Genome.

[26]  Lisa Lit,et al.  Effects of training paradigms on search dog performance , 2006 .

[27]  Joseph Terkel,et al.  The role of context specificity in learning: the effects of training context on explosives detection in dogs , 2005, Animal Cognition.

[28]  T Sitalaximi,et al.  Autosomal microsatellite profile of three socially diverse ethnic Tamil populations of India. , 2003, Journal of forensic sciences.

[29]  Kenneth G. Furton,et al.  Laboratory and field experiments used to identify Canis lupus var. familiaris active odor signature chemicals from drugs, explosives, and humans , 2003, Analytical and bioanalytical chemistry.

[30]  A. Weiss,et al.  Traits and genotypes may predict the successful training of drug detection dogs , 2007 .

[31]  James M. Johnston,et al.  Training and maintaining the performance of dogs (Canis familiaris) on an increasing number of odor discriminations in a controlled setting , 2002 .

[32]  K. Furton,et al.  Availability of Target Odor Compounds from Seized Ecstasy Tablets for Canine Detection *,† , 2011, Journal of forensic sciences.

[33]  K. Furton,et al.  Identification of odor signature chemicals in cocaine using solid-phase microextraction-gas chromatography and detector-dog response to isolated compounds spiked on U.S. paper currency. , 2002, Journal of chromatographic science.

[34]  Shanis Barnard,et al.  Agility and search and rescue training differently affects pet dogs’ behaviour in socio-cognitive tasks , 2009, Behavioural Processes.

[35]  J. Suarez,et al.  Naturalistic quantification of canine olfactory sensitivity , 2006 .

[36]  W. Helton.  Overview of Scent Detection Work: Issues and Opportunities , 2009 .

[37]  Julie B. Schweitzer,et al.  Handler beliefs affect scent detection dog outcomes , 2011, Animal Cognition.