CAMPBELL — Authorities announced the arrest of a man they say was making illegal firearms, including ghost guns, out of his Campbell apartment, which was revealed when police paid him a visit to check on his compliance with his domestic violence probation.

The discovery was made this week as Santa Clara County law enforcement agencies conducted a sweep — timed with Domestic Violence Awareness Month — focused on ensuring people were abiding by the conditions of their probation supervision.

It also coincided with the signing of a new California law that bans the sale of Glocks and other semi-automatic firearms that can be readily converted for automatic fire with the addition of a switch. The new legislation was almost immediately challenged in court by prominent gun-rights organizations.

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