Iowa Governor Terry Brandstad signed bill HF 516, which eliminated the straight-ticket device, on May 5.
The only states that still have the device are Alabama, Indiana, Kentucky, Oklahoma, Pennsylvania, South Carolina, Texas, and Utah; also it is still in effect in Michigan, even though it has been repealed, because a federal judge ordered it left in place, at least for 2016.
The Texas state house passed a bill to eliminate the straight-ticket device on May 6. A similar bill is working its way through the state senate.
Thanks to Ballot Access News for this story.