PC Harwood's legal team told the hearing the officer accepted that it was "impossible for him ever again to be employed as a police officer".
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Bernadette McAliskey was speaking on the 50th anniversary of the first civil rights march in Co Tyrone over discrimination in housing.
The 17-year-old handed himself in to Greater Manchester Police on Friday night.
The former Paisley and Renfrewshire North MP is now a councillor in Renfrewshire.