The controversial drug is back in the news. In the early days of the pandemic, President Trump and some doctors touted it as an effective treatment. But studies soon discredited the treatment. Now, in an unexpected twist, some research papers dismissing the drug have also been thrown in doubt. So how useful is Hydroxychloroquine and how reliable are the reviews we rely on to assess a drug's safety? Laura Carlson speaks to Bloomberg reporters Michelle Cortez and Robert Langreth for answers.