Porter can’t be compelled since he is scheduled to be re-tried again.

Via Slate:

The legal team for Baltimore Police Officer William Porter took steps Tuesday to keep him from being called to testify against his colleagues for the death of Freddie Gray in April. Porter’s lawyers filed a motion with the court saying he planned to invoke his Fifth Amendment rights and that he cannot be compelled to appear as a witness in the trials of fellow officers Caesar R. Goodson Jr. and Alicia White.

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