Sixth Amendment
The Sixth Amendment guarantees the right to a fair trial, including the right to an impartial jury and the right to be informed of criminal charges. In sentencing, it ensures that any fact beyond the conviction that increases the penalty must be proven to a jury beyond a reasonable doubt.
Federal Sentencing Guidelines
These are rules established to standardize sentencing across federal courts. Prior to Booker, these guidelines were mandatory, meaning judges had less discretion in sentencing. Post-Booker, they became advisory, allowing judges more flexibility while still considering the guidelines as one of many factors.
Plain Error Standard
This is a legal principle allowing appellate courts to correct errors that were not raised in the trial court, provided the error was obvious and affected the defendant's substantial rights. It ensures that significant constitutional violations do not go unaddressed even if not initially contested.
Sentencing Enhancement
An increase in the severity of a sentence based on certain factors or misconduct. In Oliver's case, his unauthorized departure from a drug treatment facility was considered obstruction of justice, leading to a harsher penalty.