Principle: The government should not prevent someone from expressing a true belief unless expressing it would be harmful to people generally.
Principle
Expressing a true belief government should wouldn't harm people generally → not prevent
Conclusion
The government should not have prevented Calista from expressing her belief [that excessive use of cell phones partly explains the recent uptick in cancer rates].
Evaluate
The rule has two criterion we need to establish, before we're allowed to conclude the right side (that the govt shouldn't prevent).
We got to know 1. true belief 2. expressing it won't harm people generally
Goal
We want to know 1. it's true that high cell phone use is partly responsible for uptick in cancer 2. expressing that fact won't harm people generally