Activists angry police who shoot can wait to face questions

After a police officer fatally shoots someone, it can take days or even weeks before the public or his supervisors hear the officer's version of what happened. In many states, that so-called cooling off period is carved out in state law or in a police department's contract. Law enforcement officials and experts say officers need to be able to collect their thoughts, so they don't provide details that are tainted by the trauma of the shooting.
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