What is the rule of thumb that calls for leaving a safety margin when the data about a particular substance's potential for harm are uncertain,and when the substance may cause unexpected or unpredictable effects?

Question

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The precautionary principle is the rule of thumb that calls for leaving a safety margin when the data about a particular substance's potential for harm are uncertain, and when the substance may cause unexpected or unpredictable effects. This principle is often used in environmental and public health policy to protect people and the environment from potentially harmful substances or activities. It suggests that it is better to be cautious and take preventive measures, even if there is some uncertainty about the risks involved, rather than wait for conclusive evidence of harm before taking action.

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