I neither agree or completely disagree with these protests. I think that the Black population is overreacting. I was not able to find any info about death in custody but I did find statistics related to arrest related deaths. The information said that 61.5% was by Homicide (Killed by someone else). This would most likely show that deaths are most likely from the police themselves. The interesting part for me was that the characteristics specified that most deaths were from White (42.1%), Male (95.4%), and from an age of about 25 to 34 (28.9%). So the graph and the math say that most police deaths are from young-ish white dudes. I am fairly certain (unless I am don't pay attention at all) that there aren't many anti-police protests about the Hispanic guy killed or the White guy killed. Only the Black guys. That's all I have to say about that.
This relates to AP-Gov because is shows the Judicial process and also the Executive power to call the National Guard (militia) and the Executive responsibility to enforce the law.
Link to Statistics done by the Department of Justice