[D]istrict courts generally enjoy a fair amount of discretion in choosing the procedures they find most helpful for resolving pretrial motions, including whether to take the matter on the briefs, hear oral argument, or hold an evidentiary hearing. And often enough courts will choose to err on the side of granting more process than might be strictly necessary in order to ensure not only that justice is done but that justice is seen to be done. Whether because of intuition born of experience that a meritorious issue may lurk in an imperfectly drawn application, or simply out of a jealous wish to guard individual rights against governmental intrusions, judges sometimes allow a claimant a fuller hearing than the law demands. In a democratic legal order built on the promise of due process and the vindication of individual rights that’s often thought laudable or at least generally permissible — and in any event not the stuff of automatic reversal.
United States v. Herrera, __ F.3d ___ (10th Cir. 2015).