Whether the Fifth or Sixth Amendments prohibit conduct for which Ramirez was acquitted—committing an alien-smuggling offense that resulted in a death—to be used to enhance his sentence for smuggling aliens.

and

Whether the government proved the proper level of causation (strict, but-for, or proximate) by the proper standard (preponderance of or clear and convincing evidence) when it found that Ramirez-Urbina was legally responsible for Lopez-Vasquez's death, the cause of which was unknown.

Whether the Fifth or Sixth Amendments prohibit conduct for which Ramirez was acquitted from being used to enhance his sentence for alien-smuggling