True....a person has the right by law to refuse a sobriety test.
A theory is a well tested explanation that can be replicated.
A hypothesis is just an educated guess that can be proven or falsified.
And a law is something that can be universalized (universal).
Ethics is something people learn every time and it differs differently on each person based on how they where raised. The focus on "administering justice" has a guide on how to properly do so. Officers and other judicial officials do not go into the job doing what they think is correct, they do what the books, laws, and policies say.
It depends on what type of government the country is. Take an example, Great Britain (England, Britain, whatever it is called.) is a monarchy, which means that they have royal families... like how we have the president. (in the U.S at least) It can also be dependent on what the country decides to do, or the president decides. I hope this helps!