I wonder if the DA has ever taken notice of the 4th Amendment to the US Constitution.
"The right of the people to be secure in their persons, HOMES, papers, and effects, against unreasonable search and seizures, shall not be violated and no warrants shall issue, but upon probable cause supported by oath or affirmation, and particularly describing the the place to be searched , and persons or things to be seized."
To be sure, the amendment allows the proper authorities to search a person's house or other property, but only based on probable cause. I don't believe the amendment's authors would consider that the mere unfounded suspicion of a cop or DA that a resident may possibly be improperly storing a firearm in his or her own home constitutes "probable cause" for issuing a search warrant.
Or perhaps in the liberal's Shangrila known as SF, the 4th Amendment has been repealed by the omnipotent SF mayor and his arrogant toadies. In that case it may be time for that courageous judge who previously threw out SF's gun ban law to once again remind the control freaks in SF's government that their bailiwick is still a part of the USA no matter how much they hate that tie to the real world, and that the Constitution is still the supreme law of the land, no matter how much they may hate it.
I loathe those creeps ...