Impact does the jury system have on the rest of the criminal justice system

Respond to the following in a minimum of 175 words:
What impact does the jury system have on the rest of the criminal justice system?
How would criminal justice function differently if defendants had no right to a trial by a jury of their peers, which is the situation in virtually all the non-common-law nations of the world?

Please provide citation and reference to sources. Quoted language must be put inside quotation marks and does not count toward the minimum word count.