DETROIT — Elections officials in Detroit are preparing for challenges that come with voting during a national health crisis that has left more than 150,000 Americans dead. City Clerk Janice Winfrey told reporters Thursday that all of Detroit’s 503 voting precincts will be open, equipped with sanitizing stations and face masks aimed at slowing the spread of the COVID-19 virus. Winfrey also said that facemasks aren’t required to cast ballots. Two drive-thru voting sites also will be open as part of a pilot program. A 20% voter turnout is expected Tuesday in Detroit. About 40,000 people are expected to vote in person. About 50,000 absentee ballots have been returned, while another 5,000 to 10,000 mail-in are expected to be returned by Tuesday.