Would you fire an employee if they "failed" a polygraph "exam"?
Diabolically clever plan!
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Scientists are not immune to disagreements. They operate by having theories which they then put to experiment. The results of experiment determine what can be considered fact, although they can be overturned by more precise data or secular changes.
In the case of the virus, what politicians are given are only projected estimates since sufficiently up to date data is not yet available.