Answer:
register with their states to vote.
Explanation:
The purpose of the voting registeration is to ensure that there is no illegal votes conducted to manipulate the resut.
Without the registration, citizens from other states could come to different states in order to vote for their candidates multiple times without getting detected
I know preliminary court is basically seeing if it's worth going further in Criminal charges ( if it is a reasonable case) then you'll have grand jury trial in which a jury will decide if there's enough evidence to indict someone (if they feel the person is really guilty) and then you have criminal court when another judge and jury decide if the person is surely guilty or not and then the person can go free or be sentenced.