According to a new report from the SF Medical Examiner's office, it's called fluorofentanyl.
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It was found during examinations of 45 people who died of drug overdoses last year.
The strain can be up to five times more powerful than prescribed fentanyl.
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The Medical Examiner's office said it did not know how many deaths this year involved fluorofentanyl because it didn't have capacity to conduct that testing.