Well, I can tell you from personal experience that California does not effectively manage our voter rolls. Our daughter ( and her husband ) lived with us for a year or so about ten years ago ( a SF East Bay city). They subsequently moved to San Francisco for two years, then purchased a home in Petaluma where they now reside. For all of that period of time, their names have been shown on the voter rolls in our precinct. When I called our Registrar of Voters, I was told that they would personally have to advise them that they had moved and wished to have their names removed. I never checked, but I imagine that they were still registered in San Francisco as well. The idea that within the state, they can’t manage to make sure residents who move around have their voter registrations reflect actually where they live at present is simply prima facie evidence that they want these “hooks” in the voter rolls to facilitate vote fraud.
This is the reason the democrats were desperate to have Motor Voter enacted back in the 90's. The county, the State Board of Elections, the Secretary of State -- none of them can update the voter rolls. Even a death certificate is not a reason to remove a name.
This is true in every state. Repealing Motor voter would go a long way to cleaning up the dead vote.