Ideally, I'd like to see the law changed such that it's illegal to carry while "under the influence" (similar to driving).
Washington state law covers being intoxicated while carrying a weapon above .10 and it does not matter that you are driving or as a passenger if you are in an area requiring a CPL you are in trouble. See the Attorney General's reply on several questions relating to local gun control.
RCW 9.41.098(1)(d) which reads as follows:
"(1) The superior courts and the courts of limited jurisdiction of the state may order forfeiture of a firearm which is proven to be:
"(d) Found concealed on a person who is in any place in which a concealed pistol license is required, AND
who is under the influence of any drug or under the influence of intoxicating liquor, having 0.10 percent or more by weight of alcohol in his blood, as shown by chemical analysis of his breath, blood, or other bodily substance;
Personally I see that RCW 9.41.270 would also come into play especially if that person were Open Carrying. See section (1)
(1) It shall be unlawful for any person to carry, exhibit, display, or draw any firearm, dagger, sword, knife or other cutting or stabbing instrument, club, or any other weapon apparently capable of producing bodily harm, in a manner, under circumstances, and at a time and place that either manifests an intent to intimidate another or that warrants alarm for the safety of other persons.
Ken Eikenberry, The Attorney General wrote on November 16, 1984, AGO 1984 No. 27 in regard to a letter by Al Williams, State Senator, 32nd District. The Senator asked several questions relating to local gun control. You can read the letter and response here: http://www.atg.wa.gov/opinion.aspx?sect ... ve&id=7660
The AG's answers:
(1) The validity of a local ordinance making it either a criminal or civil offense to be in possession of a firearm while under the influence of alcohol or other drugs will not turn on RCW 9.41.290, in the sense that such a local ordinance is, or is not, thereby statutorily preempted; instead, it will depend upon the effect which a particular ordinance has on constitutionally-protected rights.
(2) A local ordinance providing for the mandatory forfeiture of a firearm in the possession of one who is intoxicated would be within the purview of RCW 9.41.290 and, therefore, would be required to be consistent with its state statutory counterpart (RCW 9.41.098) in order to be legally effective.