About 1/10th of what it should’ve been.
ANYTHING is an improvement over what is normal for a cop.
12-1/2 years, he'll probably be out in seven years, which just happens to be roughly the average sentence served for a run of-the-mill first degree premeditated murder.
More to the point, it just might have a chilling effect on some of the more hotheaded people who know they really shouldn't be cops.