California lawmakers have approved a measure requiring prosecutors to expunge convictions or reduce sentences for many marijuana-related convictions dating back decades. The bill is now awaiting a signature from Gov. Jerry Brown, according to the Associated Press.

The bill, passed by the state Senate on Wednesday by a 22-8 vote, would require the state’s Department of Justice to review cases dating as far back as 1975 until 2016 to determine their eligibility.

Proposition 64, which was approved by California voters in 2016, legalized the recreational use of marijuana.

However, as The Associated Press notes, “When voters passed Proposition 64 in 2016 to allow adult use of marijuana, they also eliminated several pot-related crimes. The proposition also applied retroactively to pot convictions, but provided no mechanism or guidance on how those eligible could erase their convictions or have felonies reduced to misdemeanors.”

If it becomes law, it would put the burden for cleaning up those records on the state. If the bill goes into effect, state DOJ officials will have until July 1, 2019, to determine which cases are eligible for review and turn them over to the district attorney’s office, which will have another year to make any objections. [Read more at NPR]