WASHINGTON (AP) — 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.

The Supreme Court upheld the Biden administration’s regulations on “ghost guns” Wednesday, finding that guns assembled using at-home kits are subject to the same rules as traditional firearms, including requirements that they carry a serial number and that purchasers undergo a federal background check before buying them.

The Supreme Court upheld the Biden administration’s regulation of “ghost guns” in a 7-2 decision Wednesday, rejecting a challenge brought by gun rights groups and several manufacturers. The future of the crackdown remains hazy,