title: Accuracy rate of lie-detection in China: estimate the validity of CQT on field cases.
abstract: OBJECTIVE
  To explore the accuracy rate of the comparison question test (CQT) by Binomial Distribution way on field cases in Chengdu area of China. In detail, the study revealed the accuracy rate of detecting guilty and innocent examinees, and the rate of False Positive and False Negative.
  
  
  METHODS
  The study was built on the field cases with only two examinees that held the opposite opinions to the same single case. The original evaluators and four experienced polygraph specialists independently chose and scored 148 field criminal cases into the final study, among which 111 paired-records were concluded as indicative records and the rest, 37 ones, were ruled as non-indicative.
  
  
  RESULTS
  Judging from all records, the accuracy rate of detecting guilty examinees was 0.836 with a 0.164 False Negative rate. In addition, the rate to detect innocents was 0.822 with a 0.178 False Positive rate. Judging from indicative cases only excluding the non-indicative, the accuracy rate rose to 0.958 for perceiving guilty examinees with a 0.042 False Negative rate. To innocents, the accuracy rate was 0.859 with a 0.141 False Positive rate.
  
  
  CONCLUSIONS
  The study with non-standard methodology was not limited to mock cases and the final confessions. It was able to estimate validity of other lie-detection ways, GKT, POT, etc., with this method being applied. With high accuracy rate and validity, polygraph examinations were able to give better decisions to real-life investigations.
authors.affiliation: Department of Basic and Forensic Medicine, Huaxi Medical College, Sichuan University, Chengdu 610041, PR China; Criminal Detachment of Chengdu Public Security Bureau, Chengdu 610017, PR China.
authors.forename: Yuan-yi
authors.initials: YY
authors.lastname: Mao
authors.affiliation: Hospital of Yunnan University of Nationalities, Kunming, Yunnan 650031, PR China.
authors.forename: Yun-dan
authors.initials: YD
authors.lastname: Liang
authors.affiliation: Department of Basic and Forensic Medicine, Huaxi Medical College, Sichuan University, Chengdu 610041, PR China. Electronic address: huzeqing@126.com.
authors.forename: Ze-qing
authors.initials: ZQ
authors.lastname: Hu
mesh_terms: D000328:Adult; D002681:China; D003415:Crime / Q000523:psychology*; D005260:Female; D006167:Guilt; D006801:Humans; D008014:Lie Detection / Q000523:psychology*; D008297:Male; D011336:Probability; D011603:Psychophysiology; D015203:Reproducibility of Results; D012189:Retrospective Studies; D055815:Young Adult
keywords: Comparison question test (CQT); Field cases; Lie-detection; Paired examinees; Southwest area of China; The accuracy rate