The hemlock example also suggests a step toward resolution. Let the two people who disagree design an experiment that would resolve the disagreement, to one or both of the following standards:
The level of detail necessary for a scientific paper.
Such that a third party could perform the experiment without asking any extra questions.
In the hemlock example, Albert and Barry would (hopefully) notice the problem when writing up the preparation of the drink. If the experiment can be carried out practically, then it becomes relatively easy.
The hemlock example also suggests a step toward resolution. Let the two people who disagree design an experiment that would resolve the disagreement, to one or both of the following standards:
The level of detail necessary for a scientific paper.
Such that a third party could perform the experiment without asking any extra questions.
In the hemlock example, Albert and Barry would (hopefully) notice the problem when writing up the preparation of the drink. If the experiment can be carried out practically, then it becomes relatively easy.