The Latest on the arrest and death of Freddie Gray, a 25-year-old black man who died a week after he was critically injured in police custody (all times local):

12:40 p.m.

Baltimore police say the department will use web and smartphone applications to help make sure officers read and understand new rules.

The issue of officers not being aware of new or updated policies was raised in the trials of an officer charged in the death of Freddie Gray, a 25-year-old black man who was injured in police custody and died a week later.

Commissioner Kevin Davis announced Tuesday that officers will access new policies through the apps and must take a quiz before signing off. The department launches the system July 1.

Davis made the announcement one day after Officer Edward Nero was acquitted of charges stemming from Gray's arrest. Nero said he wasn't aware of an updated policy requiring officers to seatbelt prisoners.

Gray died in April 2015, a week after his neck was broken in a police van while he was not restrained by a seatbelt.

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3:20 a.m.

Baltimore's top prosecutor is facing criticism that she moved too quickly to file charges against six officers in the arrest and death of Freddie Gray, a young black man who died after suffering injuries in police custody.

A judge acquitted Officer Edward Nero on Monday of all charges in the April 2015. Legal experts say the acquittal in the racially charged case could be seen by some as a confirmation of criticism that State's Attorney Marilyn Mosby rushed to file charges.

Gray died a week after his neck was broken in the back of a police van, where he was shackled, handcuffed but unrestrained by a seat belt. His death prompted calls for justice, and rioting followed Gray's funeral.