Whether a district court may deny a reduction for acceptance of responsibility under USSG § 3E1.1 based solely on uncorroborated allegations of post plea misconduct, despite documented mental illness and substantial evidence of remorse, in violation of constitutional and guideline-based sentencing principles

1. Whether a district court may deny a reduction for acceptance of responsibility under USSG § 3E1.1 based solely on uncorroborated allegations of post plea misconduct, despite documented mental illness and substantial evidence of remorse, in violation of con stitutional and guideline -based sentencing principles.