Whether district courts, serving as Daubert/Kumho Tire gatekeepers, have a duty to assess the reliability of law enforcement officers testifying as experience-based experts, rather than rely on their qualifications alone, before allowing them the wide latitude afforded to experts testifying to a jury?

Whether Congress violated the Commerce Clause and the Tenth Amendment when it criminalized purely intrastate drug transactions on the basis that at some historic point, those drugs had crossed state lines?

Whether district courts have a duty to assess the reliability of law enforcement officers testifying as experience-based experts