On the issue of the police picking up your ex at your house. YES- they can pick him up there. If there is an outstanding warrant on a person and he is beleived to be at a residence the police can go there to look for him. On the gun situtation you have a hard pressed issue. If for many reason which I will list a few that you ex would not be allowed to own a gun they may confiscate them as evidence. You may need an attorney to get the weapons back (as he does not live at that location, you may have to prove this and prove your ownership of the weapons). I would contact the police department property room and ask them a few questions about what kind of hold they have on the guns.
Did he really sleep on the couch?
Here are a few reason he would not be allowed to have the guns:
Unless otherwise stated, if you fall into any of the following categories you are prohibited from possessing a firearm in CA for life.
Person convicted of a felony or any offense in section 12021.1 of the Penal Code.
Person who is a fugitive from justice.
Person while under indictment for just about anything.
Person who's addicted to drugs.
Person denied a firearm as a condition of probation.
Juveniles who are or were wards of the juvenile court because of some crime they committed can't own a firearm until they reach age 30.
Person who has just about any kind of restraining order filed against them can't possess a firearm while the restraining order is in effect.
Person found by a court to be mentally incompetent to stand trial, found not guilty to some crime by reason of insanity, or found to be a mentally disordered sex offender.
Person placed under a conservatorship because of a mental disorder or alcoholism.
Person who communicates a threat to a licensed psychotherapist against someone else and the psychotherapist reports it to law enforcement is prohibited from possessing a firearm for the next six months.
Person taken into custody as a danger to self or others and committed to a mental health facility is prohibited from possessing a firearm for the next 5 years.
Person who is a voluntary patient in a mental health facility is prohibited from possessing a firearm between admission and release.
Firearms Prohibiting Misdemeanors
Any person convicted of any of the following misdemeanors is prohibited from owning a firearm in CA for 10 years following the conviction.
Threatening public officers, public employees, school officials, public appointees, judges or their staff or immediate families.
Intimidating witnesses or victims.
Attempting to take a firearm away from a police officer.
Unauthorized possession of just about any kind of weapon in a state or local public building or at a public meeting.
Possessing a loaded firearm within the state capitol or legislative offices.
Possessing a loaded firearm within the governor's mansion or the residence or any other constitutional officer.
Providing a firearm to a person for use by a criminal street gang.
Assault or battery on anyone.
Assault with a stun gun, taser, deadly weapon, or any instrument likely to produce great bodily injury.
Shooting at an inhabited dwelling or just plain grossly negligent discharge of a firearm.
Willful infliction of physical injury on a spouse, former spouse, cohabitant, former cohabitant, or the mother or father of a child of one of these people.
Violation of a court order against harassment, disturbing the peace, threats or acts of violence, or violating a domestic protective/restraining order.
Drawing, exhibiting, or using any deadly weapon other than a firearm for any reason except self-defense.
Drawing or exhibiting a firearm in the presence of a police officer.
Purchasing, selling, manufacturing, shipping, transporting, distributing, or receiving an imitation firearm. This does not include obvious toys.
Inflicting serious bodily injury by drawing or exhibiting a firearm or any other deadly weapon.
Threatening to commit any crime that might result in the death or great bodily injury to another person.
Possessing a firearm in a school zone or on school grounds.
Willfully, maliciously, and repeatedly following or harassing another person (stalking).
Carrying a loaded firearm with the intent to commit a felony.
Possessing any deadly weapon with the intent to assault anyone.
Allowing a firearm in or to be discharged from a motor vehicle that you own or are driving (no matter who in the vehicle has possession of the firearm).
Criminal possession of a firearm in public while wearing a mask.
Unauthorized possession, transportation, manufacture, or sale of a machinegun.
Possession of armor piercing ammunition.
Carrying a concealed or loaded firearm or any deadly weapon or wearing a police uniform while picketing. (Does this include real cops?)
Bringing or sending contraband into or possessing contraband within a juvenile or youth authority institution. (Contraband could be a pack of cigarettes)
Firearms prohibitions as specified in sections 8100, 8101, & 8103 of the Welfare and Institutions Code (You gotta look this up yourself).