The union that represents state troopers and sergeants is defending the investigation into the death of Boston police officer John O'Keefe. 

Karen Read was acquitted of charges related to O'Keefe's death in her second trial last week after a trial where the failings of investigators was a key focus. 

The union says current and former members of the State Police have been the subject of baseless accusations.  It also indicates that the investigation into O'Keefe's death was reviewed with great scrutiny, and there is no proof it was compromised in any way.