When a criminal defendant seeks testimony from a witness who asserts the Fifth Amendment privilege as to all questions, must the district court make a particularized inquiry into the scope of that privilege before accepting it and, even if accepted, allow the witness to be called to invoke the privilege before the jury or otherwise inform the jury about the invocation?

Whether a district court must conduct a particularized inquiry into a witness's Fifth Amendment privilege before accepting a blanket assertion of self-incrimination and preventing the defendant from presenting the witness's testimony to the jury