A Moscow court on Friday acquitted a former top prison official who had been accused of negligence over the death in detention of lawyer Sergei Magnitsky in 2009, an incident that caused major tensions with the United States. Judge Tatiana Neverova of the Tverskoy district court delivered an innocent verdict for Dmitry Kratov, the former deputy head of the Butyrka jail, saying he had done everything in his power to help Magnitsky.