structural:reformatting, quality:corruption
Contradiction

All experienced courtroom observers, however, agree that jurors will have great difficulty understanding that distinction, known as "limited admissibility" or "admissibility for a limited purpose". Even more unlikely is the prospect that a juror who understands the instruction will be psychologically capable of obeying it. The only practical impact of this limited admissibility is that the evidence cannot be used to prop up a weak case that would otherwise be dismissed by the court for insufficient evidence, as it was admitted only for the impeachment of a witness.