Why do we have the burden of proving a criminal case on the prosecution, have a presumption of innocence for the accused, and the standard as proof beyond a reasonable doubt?

1.Why do we have the burden of proving a criminal case on the prosecution, have a presumption of innocence for the accused, and the standard as proof beyond a reasonable doubt? 2.What are the practical implications of these standards? Submit your work as a Word document (.doc or .docx)