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Commentary: Phallometry in Court—Problems Outweigh Benefits.

Roy O'Shaughnessy1

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The Journal of the American Academy of Psychiatry and the Law
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Summary

Phallometry is valuable for sex offender treatment and monitoring, but methodological issues limit its use in legal settings. Challenges include inconsistent methods, faking results, and poor data, affecting its reliability in court.

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Area of Science:

  • Forensic Psychology
  • Clinical Psychology
  • Sex Offender Treatment

Background:

  • Phallometry is utilized in sex offender treatment for assessing deviant drives and monitoring progress.
  • Cognitive behavioral techniques are often integrated with phallometry to reduce deviant sexual interests.

Purpose of the Study:

  • To evaluate the utility and limitations of phallometry in sex offender treatment and legal contexts.
  • To identify methodological problems affecting phallometry's reliability.

Main Methods:

  • Review of existing research on phallometry.
  • Analysis of methodological challenges including scoring, nonadmitters, and dissimulation.
  • Examination of specificity and sensitivity data.

Main Results:

  • Phallometry has methodological problems that restrict its use in legal settings.
  • Lack of consensus in methodology and scoring impacts reliability.
  • Difficulties with nonadmitters and the potential for dissimulation ('faking good') are significant concerns.

Conclusions:

  • Methodological limitations, including poor specificity and sensitivity, reduce phallometry's utility in court-related matters.
  • The reliability of phallometry is questionable in contexts influencing legal decisions like sentencing or civil commitment.