This story out of Mass. highlights the problems that can arise when legislators split election precincts to pursue their own ends in redistricting. From MassLive:

New political boundaries for the Massachusetts House and Senate became official Thursday as Gov. Charlie Baker signed into law the Legislature’s redistricting proposals, much to the dismay of the state’s top elections official, who voiced concerns about “chaos” in split precincts.

“I am extremely disappointed that these bills were signed into law in their current form and I think it is a devastating blow to the voters of Massachusetts,” Galvin said in a statement. “With local precincts divided multiple ways, it will inevitably lead to chaos at the polls and make it impossible for voters to understand who their elected representatives are.”…

On Monday, Galvin told reporters he had “very significant concerns” that the division of legislative districts could result in some precincts requiring multiple ballots.

“Because so many districts were divided, precincts old and new, by both the House map and the Senate map and in fact not the same ones being divided, some voters might be confronted with multiple ballots, where if you live on Elm Street, you get this ballot, if I’m around the corner on Maple Street, I get a totally different ballot, and maybe there’s a third level too because we’re still awaiting congressional redistricting,” Galvin said. “The question to me is: can I make these into ballots that voters will understand? At this point I’m very concerned.”