Clinical trials are monitored by safety boards tha

Quote:

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Clinical trials are monitored by safety boards that can stop a trial early if a treatment shows a powerful effect. So far, none of the trials have been halted, Dr. Fauci said.

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Does this mean the safety board is responsible to "stop the trial early" for a negative effect only, or for a powerfully positive effect that warrants drug approval. I think the former, but hope the latter, as well.....