Does an appellate court violate principles of Due Process when it disregards substantial evidence which questions a district court's drug quantity finding based on accurate and reliable evidence withheld by the government?

QUESTION PRESENTED | Does an appellate court violate principles of Due Process when it disregards substantial evidence. which questions a district court's drug quantity finding based on accurate and reliable evidence withheld by the government. . LIST OF PARTLES All parties do not appear in the caption of the case on the cover page. A list of all