The Supreme Court ruling affects ghost guns, the largely untraceable firearms used in a growing number of crimes over the past decade.

The Supreme Court on Wednesday upheld Biden-era federal regulations on “ghost guns,” mail-order kits that allow people to build untraceable weapons at home – handing gun control groups a rare win at the conservative high court.

The Supreme Court on Wednesday upheld a Biden administration regulation on the nearly impossible-to-trace weapons called ghost guns, clearing the way for continued serial numbers, background checks and age verification requirements for buying the kits online.