This detail was written using John's perspective in the scene where he threw out the Soma.
While they were in the hospital, the Deltas had all stayed in line waiting for their soma ratio. John saw all of them while they were in line.
He told the deltas that they had to give up on the drug. His words were not responded to. This got him mad and he threw the soma from the window.
This act led to a riot among the people. John was later found to be sick by Bernard and Helmotz. He explained that he had being poisoned due to the fact that he ate civilization.
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