A Boston Police sergeant was arrested after cops say he was “highly intoxicated” when they responded to a rear-end collision in Brookline. “Trooper, do you understand who I am?” off-duty BPD sergeant Mark McKeown allegedly told a state trooper trying to perform a field sobriety test on the sergeant.

An off-duty sergeant with the Boston Police Department is accused of driving drunk and crashing into another car on VFW Parkway. The sergeant, Mark McKeown, was also described in a police report of behaving in a vulgar manner toward Brookline police officers who arrived at the scene of the crash.