Assess the impact of the use of PMC or PSCs by the US government.

I NEED AT LEAST 500 WORDS.THE REFERENCES WILL BE ATTACHED.

Assess the impact of the use of PMC or PSCs by the U.S. government. You may also discuss the issue of privatization of law enforcement within the question construct. While it is generally agreed that PMCs and PSCs are cost-effective (outside of conflict zones), is the degree to which they are being used necessary and is cost the only factor that should be considered?