Some checks and balances in the news, coupled with due process and civil rights claims:
Buck's guilt is not in doubt, but his lawyers and supporters argue he deserves a new sentencting trial because race was a factor during his original sentencing in 1997. Dr. Walter Quijano, a psychologist the defense called as a witness, said that Buck would not likely be a future danger to society. But during cross-examination, prosecutors asked Quijano whether he believed the fact that Buck was black increased his potential threat to society. Quijano said yes. The jury sentenced Buck to death.
Here's a complicating factor: The defense called the witness.