The Associated Press reports:

  Nicole Richie was released from jail Thursday after serving 82 minutes of a four-day sentence for driving under the influence of drugs.
  The reality show star, who checked into a women's jail at 3:15 p.m., was released at 4:37 p.m. "based on her sentence and federal guidelines," Los Angeles County Sheriff's Deputy Maribel Rizo said without elaborating.
  Under a federal court mandate to manage jail overcrowding, arrestees sentenced to 30 days or less for a nonviolent offense are usually released within 12 hours, the sheriff's department said in a statement.
  Under the guidelines, Richie was "treated in the same manner as other inmates with a similar sentence," the statement said . . .
  Richie arrived at jail with her attorney Shawn Chapman Holley and her boyfriend, Good Charlotte singer Joel Madden. Her time at the Century Regional Detention Facility was spent getting booked, including taking a mugshot and submitting her fingerprints, Holley said.
  She didn't reach her jail cell.

  My criminal law class today covered utilitarian rationales for punishment, including deterrence, rehabilitation, and incapacitation. Your assignment: Discuss.