Rash driving by police is common in Islamabad. I see them breaking signals, over speeding, talking on cell phones, driving without seat belts and committing other outrageous crimes.
Other than that taking bribes is also pretty common, sleeping on duties, smoking pot and consuming alcohol late during the night, ON DUTY. I have witnessed these things with my own eyes.
Once i was going from F6 to F10, late during the night, around 11 pm and because it was a weekday, there was extremely low traffic. I stopped on the first signal as it was red (which joins the 7th ave and damne koh.) A cop came next to me, on the left and stood with me in his Toyota XLI police car(Islamabad Traffic Police), he looked at me and said 'Kiyaa baat he, aap jesa young larka, raat ke is waqt band Isharee pe ruka he' ... I replied 'Sir asool to hum sub ke liyee bane he na' .... He laughed,agreed AND floored his car breaking the red light !! If there was any on coming car it would ve crashed into him because he DID NOT even bother looking left or right.