TMZ

A federal judge just ruled Dassey's constitutional rights were violated when he was grilled, then tried for the murder of Teresa Halbach.

The judge ruled authorities crossed the line by interrogating the then 16-year-old without an adult present. The judge said authorities exacerbated the problem by assuring Dassey they were on his side.

And the judge said, "Dassey's borderline to below average intellectual ability likely made him more susceptible to coercive pressures than a peer of higher intellect."