Supreme Court rules 6-3 against convicted California drug smuggler who tried to change a federal expert testimony rule

Justice Gorsuch's dissent in Diaz v. United States said that the court majority effectively gives expert witnesses 'the convenient ability to read minds'

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Can an expert witness take the stand and, based on their experience, say that a particular defendant in a drug trafficking case probably knew she was smuggling drugs into the U.S.?

No.

Can that expert witness, based on their experience, say that people who attempt to smuggle drugs into the U.S. from Mexico usually know exactly what they’re doi…