"The first is whether the subject matter of the opinion falls within the class of subjects upon which expert testimony is permissible. This... may be divided into two parts: (a) whether the subject matter of the opinion is such that a person without instruction or experience in the area of knowledge or human experience would be able to form a sound judgment on the matter without the assistance of witnesses possessing special knowledge or experience in the area, and (b) whether the subject matter of the opinion forms part of a body of knowledge or experience which is sufficiently organised or recognised to be accepted as a reliable body of knowledge or experience, a special acquaintance with which by the witnesswould render his opinion of assistance to the court. The second question is whether the witness has acquired by study or experience sufficient knowledge of the subject to render his opinion of value in resolving the issues before the court. "
"I am a retired traffic patrol officer with the Metropolitan Police, having served 7 years in the traffic department. I have passed the City & Guilds certificate in advanced vehicle examination, air brake technology and tachograph recording and calibration devices. I have also qualified with the police as an advanced accident investigator and reconstruction officer. I have held an HGV licencesince 1976. Prior to joining the Metropolitan Police, I was in the Royal Engineers for 13 years, during which I was employed in theregimental servicing and inspection bay responsible for maintenance and planning of the regimental vehicles, including plant machines. [In] 2004 [I] passed a masters degree with distinction in transport law."
"2. On3rd January 2008 , the court heard expert evidence from Mr Langdon on behalf of the Crown Prosecution Service as to the operation and use of the Laser LTI 20:20 speed detection device. Mr Langdon's qualifications are set out in his report... We particularly noted that Mr Langdon had attended expert witness courses on the Laser LTI 20:20 in the UK and in Holland, and he had also recently attended a course run by the device's manufacturer in Denver, Colorado. "3. During the course of his evidence, Mr Langdon raised doubts about the conclusions drawn by Mr Doughty in his report which had been prepared for the court. Mr Langdon questioned Mr Doughty's expertise on the operation of the Laser LTI 20:20 device. "4. On1st February 2008 , the defendant Paul Anderson called Graham Doughty to give expert evidence on the operation and use of the Laser LTI 20:20 device. "5. Mr Doughty's professional qualifications and experience are set out in his report prepared for the bench... We noted that Mr Doughty had not attended any courses which specifically covered theoperation and use of the Laser LTI 20:20 speed detection device. "6. As Mr Doughty's credentials had been called into question, we decided to makepreliminary enquiries to determine whether or not he did qualify as an expert witness who would be in a position to assist the courtin its deliberations by giving evidence of his opinion. We determined that there was a need for expert evidence in the case of R v Paul Andersonto assist the court in the operation and use of the Laser LTI 20:20 speed detection device. "7. We considered whether Mr Doughty hadacquired by study or by experience sufficient knowledge of the subject to render his opinion of value in resolving the issues before the court. "8. We found that Mr Doughty had not acquired sufficient knowledge of the subject: "i) Mr Doughty retired from the Metropolitan Police Force in September 1999 and has therefore not operated a LTI 20:20 device since that date. "ii) Mr Doughty has not attended courses in the UK or in Holland on the use of the Laser LTI 20:20 speed detection device. He has not attended the expert witness course in Denver, Colorado run by the manufacturer of the Laser LTI 20:20 speed detection device. Mr Doughty did not therefore have an equivalent level of expertise to Mr Langdon, the expert witness called by the Crown Prosecution Service. "iii) Qualifications on road traffic law and engineering without practical experience of the Laser LTI 20:20 do not indicate that Mr Doughty has the ability to assist this court in determining issues relating to the intricacies of the LTI 20:20 device. "9. Accordingly, the bench determined that Mr Doughty was not an expert witness and therefore could not give evidence of his opinion with regard to the case of R v Paul Anderson."
"In response to our conversation of this morning, I must inform you that we do not offer courses to become an expert witness on our equipment to persons involved in the defense of traffic violations. Pleaseunderstand that we extend our loyalty to the traffic enforcement agencies that operate our equipment in an effort topromote traffic safety world wide. It would be a conflict of interest relative to our customers and our own beliefs to do so."