Like stated above, it depends on the department. Some departments have the money and willingness to provide the absolute best, others either can't or think that an inadequate product is adequate.
Most shots are going to be close range for a police dept. There have been many times where 51yds has been thrown out in print for the average engagement range, and shots over 100yds are almost unheard of for a dept. I don't think that there really is a statistic, but would be willing to bet that most shots are inside or around 50yds.
I personally don't think that anything more than 10x would be necessary for a police unit. Then again, I don't get paid to make those decisions either. YMMV.