Established Fields of Expert Evidence

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General Principles

All fields of forensics is about making associations with available information. These associations can be used by the trier-of-fact to make inferences.

General Medical Practitioner

  • an "expert witness in family medicine permitted to give opinion evidence on the diagnosis, prognosis and treatment of injury of all parts of the body, including neck, back and shoulder"[1]
  • "qualified as a duly qualified general medical practitioner, licensed to practice medicine in Nova Scotia, and qualified to give opinion evidence on the diagnosis, prognosis and treatment of human beings"[2]
  • "emergency medicine diagnosis and treatment"[3]
  1. ↑ Awalt v Blanchard, 2011 NSSC 111 (CanLII), per Coady J, at para 41
  2. ↑ R v Hutchinson, 2011 NSSC 361 (CanLII), 985 APR 1, per Coughlan J
  3. ↑ R v Rothgordt, 2017 BCCA 230 (CanLII), per Frankel JA, at para 16

Medical Specialists

  • "orthopaedic surgeon qualified as an expert to give opinion evidence in the diagnosis, prognosis and treatment of knee injuries"[1]
  1. ↑ Jando v Kung, 1994 CanLII 9076 (AB QB), 25 Alta LR (3d) 84, per Nash J, at para 83

Drug Trafficking

Gangs

Experts have been qualified in several issues related to gangs:

  • workings of a motorcycle gangs [1]
  • meaning of tear-drop tattoo in street gang [2]
  • nature and characteristics of the Hells Angels organization; the main purposes and activities of the Hells Angels organization and whether they constitute the facilitation or commission of serious criminal offences that afford a material benefit to its members.[3]
  1. ↑ R v Duguay, 2009 QCCA 1130 (CanLII), RJQ 1591, per curiam
    R v Alcantara, 2012 ABQB 225 (CanLII), 538 AR 44, per Greckol J - qualified to testify to a number of details on the Hells Angels MC
  2. ↑ R v Abbey, 2009 ONCA 624 (CanLII), 246 CCC (3d) 301, per Doherty JA
  3. ↑ R v Lindsay, 2004 CanLII 34074 (ON SC), 63 WCB (2d) 464{, per Fuerst J

Firearm Forensics

  • "evidence on the subject of the forensic analysis of firearms and ammunitions, including firearm identification, the identification of fired ammunition components as well as ballistics and toolmark identification"[1]
  • toolmark and firearms identification[2]
  • "give expert opinion evidence on the subject of the forensic analysis of firearms and ammunitions, including firearm identification, the identification of fired ammunition components as well as ballistics and toolmark identification"[3]
  • expert in "the theory, operation and identification of firearms", "the examination and identification of fired and unfired ammunition components", "the examination and identification of toolmarks", "the theory and operation of the comparison microscope", "the theory and practice of ballistic assessment".[4]
  1. ↑ R v Abdow, 2011 ABQB 129 (CanLII), per Burrows J, at para 179
  2. ↑ e.g. R v Belic, 2011 ONCA 671 (CanLII), per curiam
  3. ↑ R v Abdow, 2011 ABQB 129 (CanLII), per Burrows J, at para 179
  4. ↑ R v Safadi, 1993 CanLII 1739 (PE SCTD), 339 APR 66, per DesRoches J

Injuries

  • "qualified as a duly qualified general medical practitioner, licensed to practice medicine in [the province], and qualified to give opinion evidence on the diagnosis, prognosis and treatment of human beings"[1]
  1. ↑ R v Hutchinson, 2011 NSSC 361 (CanLII), 985 APR 1, per Coughlan J, at para 19


DNA Analysis

Described areas of opinion evidence has included:

  • "identification of bodily fluids and the forensic aspects of DNA typing."[1]
  • DNA experts will not be able to testify as to the likelihood of accidental transfer of DNA.[2]

Problems in DNA evidence can include the possibility of DNA transfer between people as well as confirmation bias where the testers know the identity of the suspect.[3]

There are several types of DNA sample analysis:[4]

  • autosomal DNA analysis (atDNA)
  • mitochondrial DNA analysis (mtDNA); and
  • y-Chromosome DNA analysis (y-DNA)

There are generally two methods of DNA sampling:

  • Short Tandem Repeats (STR) [2]
  • single-nucleotide polymorphism (SNP) [3]
Y-STR DNA

Y-STR profile is a patrilineal-inherited profile that is only found on male DNA. It will show the odds that a randomly selected male individual unrelated to the targeted person (usually the accused) would match the sample DNA.[5]

Police in Ontario have been using it as early as 2005.[6]


  1. ↑ R v Lafferty, 1993 CanLII 3409 (NWT SC), 80 CCC (3d) 150, per Vertes J - also includes detailed summary of analysis process
  2. ↑ e.g. R v Doan, 2013 BCCA 123 (CanLII), per curiam
  3. ↑ Erin Murphy, "The Art in the Science of DNA" (2008) 58 Emory L.J. 489
  4. ↑ see also DNA Profiling (wikipedia)
  5. ↑ R v JL, 2018 ONCA 756 (CanLII), 367 CCC (3d) 249, per Pepall JA, at para 25
    R v Pierce, 2017 BCSC 2469 (CanLII), at para 174
  6. ↑ R v Milani, 2012 ONSC 6892 (CanLII), per Pierce J, at paras 48 to 49

Psychology and Psychiatry

Dog Tracking

Before a judge should consider expert evidence of a specific tracking by a particular dog, the court there must be enough evidence establishing:[1]

  • the reliability of the dog breed; and
  • the reliability of the specific dog.

The court should be satisfied with the evidence of the following regarding the dog:[2]

  • dog's training
  • success rates
  • susceptibility to distractions, such as irrelevant scents, cats or other dogs.

The handler is expected to give sufficient detail on "the process, sequence and outcome of the tracking, preferably supported by contemporaneously or near contemporaneously compiled notes." [3]

The trial judge should always give a warning to a jury that "such evidence should be evaluated in terms of the facts of the particular case, and that it falls into the category of evidence in respect of which special care needs to be exercised because the source of the evidence, the dog, is not able to be made subject to the usual check and balance of the court system - cross-examination."[4]

Cases where dogs have been qualified:

  • R v Sherman, [1997] BCJ No 2472(*no CanLII links)


R v Rackley, 1996 CanLII 8296 (ON SC), 1 CR (5th) 395, per McKinnon J
R v Klymchuk, 2001 CanLII 28406 (ON SC), 155 CCC (3d) 423, per Wein J
R v Nguyen, 1999 BCCA 98 (CanLII), 119 BCAC 62, per Newbury JA

  1. ↑ R v Holmes, 2002 CanLII 45114 (ON CA), 169 CCC (3d) 344, per Rosenberg JA, at para 37
  2. ↑ Holmes, ibid., at para 37
  3. ↑ Holmes, ibid., at para 37
  4. ↑ Holmes, ibid., at para 37

Wording

  • qualified as an expert "dogmaster dealing with the use of dogs in criminal investigations, tracking, and for identifying the location of human scent"[1]
  1. ↑ R v Rayner, 2007 PESCTD 22 (CanLII), 811 APR 308, per Cheverie J, at para 72

Computer-related Forensics

See also: Peer-to-Peer Investigation (Model Examinations) and Sexual Offences#Peer-to-Peer Investigations

Defined area of qualification:

  • area of computer forensics involving the identification, extraction, preservation, and interpretation of storage and recovery of data from electronic media[1]
  • child exploitation investigations in relation to peer to peer file sharing networks[2]
  • peer to peer file sharing programs including GigaTribe, Limewire, Shareaza, etc.[3]
  • the use of EnCase computer forensic software [4]
  • “the operation and function of Facebook as a social media portal, and the interpretation of Facebook account records”[5]
  • “online cloud storage and internet investigations”[6]

Computer activity logs include:

  • System Resource Usage Monitor (SRUM) - used to determine whether activity is software vs user based in userid indicators [4]
  • Browsing history
  1. ↑ R v Wainwright, 2012 BCPC 123 (CanLII), per Wainwright J, at para 69
    R v Pelich, 2012 ONSC 3611 (CanLII), 103 WCB (2d) 295, per Dunnet J, at para 29
  2. ↑ R v Pelich, 2012 ONSC 3224 (CanLII), per Dunnet J
    R v SDP, 2012 SKQB 330 (CanLII), 103 WCB (2d) 1051, per Dovell J
    R v Benson, 2010 SKQB 459 (CanLII), SJ No 758, per Gerein J
  3. ↑ SDP, supra
    Benson, supra
  4. ↑ Benson, supra
  5. ↑ R v Moazami, 2013 BCSC 2398 (CanLII), per Bruce J
  6. ↑ R v Cusick, 2019 ONCA 524 (CanLII), 146 OR (3d) 678, per Juriansz JA, at para 29

When Qualification is Not Needed

Using Techonology From User's Perspective

It should not be necessary to have the expert testify as to the "basic functions" of computer storage devices. The suggestion seems to be that basic functionality of any appliance is not in need of proof.[1] Similarly, it should not be necessary to qualify an expert to speak to the use of electronic devices, social media website, and other internet applications.[2]

Text Messaging

It should not be necessary to have someone testify as to the "sequence and lapsed timing of messages" in a messaging application.[3]

Cell Towers

There may be no need to for expert qualification for the interpretation of cellphone records or description on how cell phones transmit data to towers.[4]

Child Exploitation

It was also found to be valid for a layperson to describe child pornography websites and the search terms and file named associated with them.[5] There is some suggestion that even the workings of file-sharing programs do not require expert qualification.[6]

See also: R v Baxter, 2009 ONCJ 16 (CanLII), per Bovard J

  1. ↑ R v Wonitowy, 2010 SKQB 346 (CanLII), 358 Sask R 303, per Dufour J, at para 46 - in context of an ITO for a search warrant on a child pornography case
  2. ↑ R v Soh, 2014 NBQB 20 (CanLII), 1079 APR 328, per LaVigne J
  3. ↑ R v Ambrose, 2015 ONCJ 813 (CanLII), per Paciocco J, at para 56
  4. ↑ R v Hamilton, 2011 ONCA 399 (CanLII), 271 CCC (3d) 208, per curiam
    R v Singh, 2015 ONSC 6823 (CanLII), per Coroza J
    R v Browne, 2017 ONSC 5060 (CanLII), per Coroza J
  5. ↑ R v Campancioni, 2016 ONSC 4615 (CanLII), per Gareau J
  6. ↑ Campancioni, ibid.

Forensic Pathology

Wording

  • "opinion evidence in that field including expressing an opinion as to the causes of the injuries suffered by the deceased and the causes and times of their deaths"[1]
  • "opinion evidence with respect to the cause of injuries to the human body and the cause of death".[2]
  • "forensic pathology, including the cause and effect of serious injury and sudden death."[3]
  1. ↑ R v Despres, 2008 NBQB 99 (CanLII), 849 APR 299, per Grant J, at para 13
  2. ↑ R v BT, 2012 NSPC 88 (CanLII), per Derrick J, at para 20
  3. ↑ R v Ejigu, 2016 BCSC 2278 (CanLII), per Davies J, at para 237

Serologist

Wording

  • "forensic biologist who was qualified as an expert in relation to the identification of bodily fluids and DNA analysis".[1]

They may need to specify whether the topic of serology concerns the identification of blood, saliva, sweat, semen, or vagina fluids.

  1. ↑ R v NC, 2007 CanLII 5691 (ON SC), per Sproat J
    R v Rayner, 2007 PESCTD 22 (CanLII), 811 APR 308, per Cheverie J, at para 106 ("forensic biologist with expertise in the area of identification of bodily fluids and the analysis and interpretation of DNA profiles")
    R v Lafferty, 1993 CanLII 3409 (NWT SC), 80 CCC (3d) 150, per Vertes J ("expert evidence on the identification of bodily fluids and the forensic aspects of DNA typing")

Blood Stains

  • "field of forensic bloodstain pattern analysis and to interpret the physical events that give rise to the shape, location, size and distribution of bloodstains"[1] of a "crime scene in order to interpret the physical events that gave rise to its origins."[2]
  1. ↑ R v Hawkins, 2011 NSCA 6 (CanLII), 265 CCC (3d) 472, per Beveridge JA, at para 27
  2. ↑ R v Despres, 2008 NBQB 99 (CanLII), 849 APR 299, per Grant J

Forensic Toxicologist

  • "opinion evidence in relation to the absorption, distribution and elimination of drugs and alcohol and poisons in the human body, the pharmaceutical and toxicological effects of drugs, alcohol and poison in the human body, and the effects of drugs on the human body with respect to the operation of a motor vehicle"[1]
  • "opinion evidence in the absorption, distribution and elimination of alcohol in the human body, in forensic toxicology and the effect of alcohol consumption on the human body."[2]
  • "opinion evidence about the absorption, distribution, and elimination of drugs and alcohol in the human body as well as the pharmacological and toxicological effect of alcohol, drugs and poisons on the central nervous system"[3]
  • "opinion in the area of forensic toxicology, specifically the ingestion, absorption and elimination of alcohol in the human body, the calculation of blood/alcohol concentrations in the body, the theory and operation of approved instruments and the effects of alcohol upon the human body with respect to the operation of motor vehicles"[4]
  • "qualified to give expert evidence with respect to the pharmacological and toxicological effects of drugs, alcohol and poisons on the human body and with respect to the absorption, distribution and elimination of drugs, alcohol and poisons in the human body"[5]
  • "the interpretation of toxicological reports and findings"
  • "the measurement of alcohols and drugs in bodily fluids and solutions, and the suitability of the samples for analysis"
  • "the effect of drugs and alcohol on performance and behaviour, including on the ability of individuals to operate a motor vehicle;
  • "the administration and interpretation of drug influence evaluation procedures"


Forensic Aloholic Specialist
  • "Forensic Alcohol Specialist and he was qualified as an expert to provide opinion evidence in regards to the absorption, distribution and intake of alcohol in the body"[6]
  • "forensic alcohol specialist employed with the RCMP forensic laboratory in Halifax was qualified as an expert in the effects of alcohol on the human body and in absorption and elimination rates of alcohol from the human body"[7]
  1. ↑ R v Greenwood, 2010 ONSC 912 (CanLII), per Durno J , at para 18
  2. ↑ R v Lyth, 2013 ABPC 281 (CanLII), per Skene J, at para 34
  3. ↑ R v JR, 2006 CanLII 22658 (ON SC), 40 CR (6th) 97, per T Ducharme J, at para 51
  4. ↑ R v Dhanjal, 2011 ONSC 742 (CanLII), per Miller J , at para 14
  5. ↑ R v Daneluzzi, 2009 ONCJ 398 (CanLII), per Harris J , at para 19
  6. ↑ R v Steven Vance Rasmussen, 2013 NBPC 2 (CanLII), per Duffie J , at para 21
  7. ↑ R v Stevens, 2007 NSSC 148 (CanLII), 814 APR 201, per Murphy JJ, at para 18

Footprint Analysis

Footprint analysis has been controversial and not always accepted.[1]

  1. ↑ R v Dimitrov, 2003 CanLII 50104 (ON CA), 181 CCC (3d) 554, per Weiler and Hillese JJA
    R v Nielsen and Stolar, 1984 CanLII 40 (MB CA), 16 CCC (3d) 39, per Huband JA (2:1)
    See also R v T , [2010] EWCA Crim 2439 (UK) [1] for consideration on utility of analysis

Fingerprints

  • "comparison, identification and analysis of fingerprints, which indicates the examination of scenes of crime for latent fingerprints, the use of Automated Fingerprint Identification System (A.F.I.S.) and the search and comparison of fingerprint files in order to establish identity"[1]
  • a Forensic Identification Specialist qualified as an "expert in the identification, comparison and individualization of fingerprints".[2]
  1. ↑ R v Qureshi, 2011 ABPC 92 (CanLII), 508 AR 128, per Malin J, at para 30
  2. ↑ R v Bornyk, 2013 BCSC 1927 (CanLII), per Funt J

Arson-related Forensics

  • "determination of origin, cause and circumstances of the fire"[1]
  • "determining the cause and origin of a ... fire, in understanding burn patterns, the location of the "seat" of a fire, and its movement during the course of a burn" [2]
  • "forensic chemistry in the field of accelerant analysis, identification and analysis"[3]
  1. ↑ R v Fournel, 2012 ONSC 375 (CanLII), OJ No 1051, per Hennessy J
    see also R v Alpine, 2008 BCPC 508(*no CanLII links)
    R v O'Brien, 2002 YKTC 45 (CanLII), per Lilles CJ
    R v Jonkman, 2012 SKQB 511 (CanLII), 410 Sask R 171, per Schwann J "expert in fire investigation, cause and origin"
  2. ↑ R v Payette, 2010 MBQB 73 (CanLII), 253 Man R (2d) 181, per Duval J
  3. ↑ Elliott v Royal Insurance Company of Canada, 1995 CanLII 4495 (NS SC), 403 APR 365, per A Boudreau J

Other Sciences

  • "facial mapping"[1]
  • "ear print" identification[2]
  • Crime scene analysis including staging [3]
  • identification based on gait of walk.[4]
  • handwriting evidence permitted despite experts inconclusive evidence[5]
  • forgery
  • Forensic entomology
  • “the function, effect, examination, diagnosis and repair of electrical work, problems and hazards” in relation to an Occupational Health and Safety prosecution[6]
  • evidence on the "cultural mores within particular communities".[7]
  1. ↑ R v Clarke , [1995] 2 Cr. App. R. 425 (CA) (UK)
  2. ↑ R v Dallagher , [2003] 1 Cr. App. R. 195 (UK)
  3. ↑ R v Clark, 2004 CanLII 12038 (ON CA), 182 CCC (3d) 1, per Moldaver JA
  4. ↑ R v Aitken, 2012 BCCA 134 (CanLII), 319 BCAC 125, per Hall JA, at para 63
  5. ↑ R v Garniss, 2011 ONSC 6559 (CanLII), per Ray J
  6. ↑ R v Farnham, 2016 SKCA 111 (CanLII), 12 WWR 635, per Ryan-Froslie JA
  7. ↑ R v Shafia, 2016 ONCA 812 (CanLII), 341 CCC (3d) 354, per Watt JA, at para 240

Credibility of Witnesses

A judge should not simply accept an expert's opinion on credibility.[1]

  1. ↑ R v Marquard, 1993 CanLII 37 (SCC), [1993] 4 SCR 223, per McLachlin J ("A judge or jury which simply accepts an expert's opinion on the credibility of a witness would be abandoning its duty to itself determine the credibility of the witness")

Other Social Science

  • the meaning of the "code of silence" and its effect on witness's willingness to tell the truth.[1]
  • determining a community standard, typically in reference to an obscenity charge[2]
  • interpreting Patois[3]

General expert evidence on false confessions has been excluded as it was not necessary, while opinion specific to the case has been permitted.[4]

  1. ↑ R v Boswell, 2011 ONCA 283 (CanLII), 277 CCC (3d) 156, per Cronk JA
  2. ↑ R v gd2lq, CanLII 2864 (ON CA) 52 CCC (2d) 257, per Brooke JA
    R v Prairie Schooner News Ltd. and Powers, 1970 CanLII 1059 (MB CA), 1 CCC (2d) 251, per Freedman JA
    R v Great West News Ltd., Mantell and Mitchell, 1970 CanLII 1064 (MB CA), [1970] 4 CCC 307, per Freedman JA
    R v Red Hot Video Ltd, 1985 CanLII 633 (BC SC), 18 CCC (3d) 1, per Nemetz J
  3. ↑ e.g. Referenced in R v Masters, 2014 ONCA 556 (CanLII), 313 CCC (3d) 275, per Tulloch JA
  4. ↑ R v Bonisteel, 2008 BCCA 344 (CanLII), 236 CCC (3d) 170, per Levine JA, at paras 66, 69 - suggests that a proper jury instruction will suffice

Legal Topics

  • expert in laws of certain US states on a specific topic[1]
  1. ↑ e.g. R v Murray, 2014 ABPC 112 (CanLII), per LeGrandeur J - laws relating to wildlife in Alaska

Non-scientific Areas

  • "brokering residential mortgages, including NIQ mortgages"[1]
  1. ↑ R v Nguyen, 2014 BCSC 55 (CanLII), per Joyce J, at para 35

Failed Qualifications

Similar issues have been disqualified:

  • A police officer was refused qualification as an expert is risk assessment of an offender in a sentencing hearing. [1]
  • profiling of a sexual abuse victim.[2]
  • expert on evidence suggesting "staging" of a crime to divert attention[3]
  • embedded false subjective memories in children.[4]
  1. ↑ R v Shehaib, 2012 ONCJ 144 (CanLII), per Wake J
  2. ↑ R v Olscamp, 1994 CanLII 7553 (ON SC), 95 CCC (3d) 466, per Charron J
  3. ↑ R v Stobbe, 2012 MBQB 78 (CanLII), 277 Man R (2d) 112, per Martin J
  4. ↑ R v TH, 2017 ONCA 485 (CanLII), per MacPherson JA
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