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Related Experiment Videos

Marijuana odor perception: studies modeled from probable cause cases.

Richard L Doty1, Thomas Wudarski, David A Marshall

  • 1Smell and Taste Center, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA. doty@mail.med.upenn.edu

Law and Human Behavior
|May 15, 2004
PubMed
Summary

Law enforcement

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Area of Science:

  • Forensic science
  • Law and jurisprudence
  • Human sensory perception

Background:

  • The Fourth Amendment protects against unreasonable searches and seizures.
  • Law enforcement often uses odor detection for probable cause, particularly for marijuana.
  • The reliability of odor detection for establishing probable cause is seldom questioned.

Purpose of the Study:

  • To empirically test the reliability of marijuana odor detection by law enforcement.
  • To investigate the use of marijuana odor as probable cause in legal cases.
  • To assess human ability to detect marijuana under simulated real-world conditions.

Main Methods:

  • Two empirical studies simulating real legal cases involving marijuana odor.
  • Study 1: Simulated traffic stop with packaged marijuana in trunk, odor detection through driver's window.

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  • Study 2: Investigated marijuana odor detection from a distance near diesel exhaust from a grow room.

    • Main Results:

    • Marijuana odor was not reliably discernible in either simulated scenario.
    • Findings indicate limitations in human olfactory detection of marijuana under tested conditions.
    • Even individuals with an excellent sense of smell could not reliably detect the odor.

    Conclusions:

    • The reliability of marijuana odor as the sole basis for probable cause is questionable.
    • These studies provide the first empirical data on human detection of marijuana odor in law enforcement contexts.
    • Results have significant implications for legal standards of probable cause and search warrants.