Turns out they have the following law (italics are mine):
Some comments from that forum from those who had experience with that law...RCW 9.41.300(1)(b)
(1) It is unlawful for any person to enter the following places when he or she knowingly possesses or knowingly has under his or her control a weapon:
(a) The restricted access areas of a jail, or of a law enforcement facility, or any place used for the confinement of a person (i) arrested for, charged with, or convicted of an offense, (ii) held for extradition or as a material witness, or (iii) otherwise confined pursuant to an order of a court, except an order under chapter 13.32A or 13.34 RCW. Restricted access areas do not include common areas of egress or ingress open to the general public;
(b) Those areas in any building which are used in connection with court proceedings, including courtrooms, jury rooms, judge's chambers, offices and areas used to conduct court business, waiting areas, and corridors adjacent to areas used in connection with court proceedings. The restricted areas do not include common areas of ingress and egress to the building that is used in connection with court proceedings, when it is possible to protect court areas without restricting ingress and egress to the building. The restricted areas shall be the minimum necessary to fulfill the objective of this subsection (1)(b).
For purposes of this subsection (1)(b), "weapon" means any firearm, explosive as defined in RCW 70.74.010, or any weapon of the kind usually known as slung shot, sand club, or metal knuckles, or any knife, dagger, dirk, or other similar weapon that is capable of causing death or bodily injury and is commonly used with the intent to cause death or bodily injury.
In addition, the local legislative authority shall provide either a stationary locked box sufficient in size for pistols and key to a weapon owner for weapon storage, or shall designate an official to receive weapons for safekeeping, during the owner's visit to restricted areas of the building. The locked box or designated official shall be located within the same building used in connection with court proceedings. The local legislative authority shall be liable for any negligence causing damage to or loss of a weapon either placed in a locked box or left with an official during the owner's visit to restricted areas of the building.
The local judicial authority shall designate and clearly mark those areas where weapons are prohibited, and shall post notices at each entrance to the building of the prohibition against weapons in the restricted areas;
I check my firearms in the lockbox at our courtroom here all the time. When I was on a jury last year, and instructed to use the special jury entrance when entering/exiting the building to avoid mingling with participants in the trial, the judge arranged for the bailiff to escort me to/from the lockbox facility when I arrived and left the building.
They're required to provide a place where you can secure it. Based on the courthouses that I've been in, it will probably be a little locker where you drop a quarter in to release the key. It will also very likely be visible to the general public (although probably a little out of the way and easiliy overlooked). When you walk in the front door, just tell the guard or receptionist (whichever is easier to get to) that you have some items that you need to secure before passing through the security checkpoint and he should be able to direct you to the right spot.
Within the confines of having a CHL law, and places that restrict carry, such an addition to the Texas statutes would be a good thing...I'm sitting in the jury commons right now. It was a breeze, no trouble at all. I'm at the Seattle courthouse on 3rd ave. Walked in the revolving door and waived over one of the officers and told them I needed a lockbox. He asked if I had a firearm and I said yes. They actually take you to a security room and let you put the gun in a locker, free of charge (at this courthouse anyways). The officer did not give me the key. I didn't say anything but the law says "a key to the owner." Oh well...At least I had it for the bus ride and the walk through Pioneer Square. Never noticed how many bums are in this part of town.
Oh, they also provide free wi-fi for those who would like to use it.
And as CHL holders continue to increase as a percentage of the general population, I suggest that we may see this happen, albeit slowly.