SAN JOSE — Santa Clara County plans to expunge 13,000 minor marijuana convictions that were rendered moot by the state’s 2016 legalization of recreational pot use and sales, two months before a deadline set by the landmark law.

But in the South Bay, it’s not just criminal-justice or drug policy story. Keeping in line with the region’s technological lineage, the District Attorney’s Office also made it a coding story.

That’s because with the anticipated signature of Judge Eric Geffon in a Hall of Justice courtroom Wednesday, prosecutors are planning to automatically clear those conviction records from local, regional and federal law-enforcement databases with software created in-house by the DA’s technology staff.

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