The high court on Monday turned away a challenge to the ban, which took effect in October 2018. A lower court had dismissed the challenge at an early stage and that decision had been upheld by an appeals court. As is typical, the court didn't comment in declining to take the case.
Maryland's ban preceded a nationwide ban on the sale and possession of bump stocks that was put in place by the Trump administration and took effect in 2019. The Supreme Court previously declined to stop the Trump administration from enforcing that ban. Both Maryland's ban and the nationwide one followed a 2017 shooting in Las Vegas in which a gunman attached bump stocks to assault-style rifles he used to shoot concertgoers from his hotel room. Fifty-eight people were killed and hundreds were injured.