Constitutionally dubious.
Via Washington Times:
Gun-safety legislation going into effect in California next week will allow authorities to seize a person’s weapons for 21 days if a judge determines there’s potential for violence.
Proposed in the wake of a deadly May 2014 shooting rampage by Elliot Rodger, the bill provides family members with a means of having an emergency “gun violence restraining order” imposed against a loved one if they can convince a judge that allowing that person to possess a firearm “poses an immediate and present danger of causing personal injury to himself, herself or another by having in his or her custody or control.”