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Home | Critical Care Compendium | Precautionary Principle and the Kehoe Principle

Precautionary Principle and the Kehoe Principle

by Chris Nickson, Last updated April 21, 2014

OVERVIEW

  • The Precautionary Principle and Kehoe Principle reflect different conceptions of risk in the absence of evidence

THE KEHOE PRINCIPLE

  • The ‘Kehoe Principle’ is a commonly made misconception summarised as:

“The absence of evidence of risk = Evidence of the absence of risk”

  • Robert A. Kehoe was a toxicologist employed by the Ethyl Corporation in the 1920s
  • He exemplified the ‘show me the data‘ mentality in defending the safety of leaded petrol
  • His stance was based on the rationale that there was no convincing published evidence of harm to humans
  • Subsequent research demonstrating harm led to the complete removal of lead from gasoline in the United States by 1986

PRECAUTIONARY PRINCIPLE

  • This is a safer, more rational approach to think about risk in the absence of evidence:

“The absence of evidence of risk = a possibility of risk until proven otherwise”

  • use of the precautionary principle puts the burden of proof on those that claim an action does not cause harm
  • however, it is not a useful decision-making principle on it’s own — any course of action needs to weight the benefits and risks — and all claims (whether for benefit or risk) carry a burden of proof

References and Links

Journal articles

  • Nriagu JO. Clair Patterson and Robert Kehoe’s paradigm of “show me the data” on environmental lead poisoning. Environ Res. 1998 Aug;78(2):71-8. PubMed PMID: 9719610.
  • Peterson M. The precautionary principle should not be used as a basis for decision-making. Talking point on the precautionary principle. EMBO Rep. 2007 Apr;8(4):305-8. PubMed PMID: 17401402; PubMed Central PMCID: PMC1852769.

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About Chris Nickson

An oslerphile emergency physician and intensivist suffering from a bad case of knowledge dipsosis. Key areas of interest include: the ED-ICU interface, toxicology, simulation and the free open-access meducation (FOAM) revolution. @Twitter | + Chris Nickson | RAGE | INTENSIVE| SMACC

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