250 words and two scholarly references

In our readings for this week, we see that many of the nations we studied have a national police force of some form as compared to the state/local format for the United States. Discuss in detail either the positive aspects of a national police force, or the negative aspects.  Would such a national force work in the United States?  Are there advantages from a national police force?  Compare the advantages and disadvantages. This should provide a foundation for some good give-and-take discussion between you.