  The 2020 Decennial Census will be released with a new disclosure avoidance
system in place, putting differential privacy in the spotlight for a wide range
of data users. We consider several key applications of Census data in
redistricting, developing tools and demonstrations for practitioners who are
concerned about the impacts of this new noising algorithm called TopDown. Based
on a close look at reconstructed Texas data, we find reassuring evidence that
TopDown will not threaten the ability to produce districts with tolerable
population balance or to detect signals of racial polarization for Voting
Rights Act enforcement.
