You should find out which Court has the warrant and then call the Court to determine the warrant quash procedures. Often times you can clear the warrant by appearing at the clerks office and signing a promise to appear and sometimes posting an appearance fee ($100-200). This is the first step in resolving the outstanding warrant, don't just wait because then you will be arrested at the most inopportune time. Courts like to see that you are taking care of your matters.
The Court rule that you need is IRLJ 3.1 (see link http://www.courts.wa.gov/court_rules/?fa=court_rules.display&group=clj&set=IRLJ&ruleid=cljirlj3.1 ) If the prosecutor fails to provide the information (officer's report) timely then you should make a motion to dismiss pursuant to the above rule. You do not need to take the extra step of asking the Court, the prosecutor appears to be relying on the Court to do their work.
Unfortunately, you can be sent a ticket in the mail. In your specific fact scenario, the tabs need to be on the car not just bought; however, you can contest the matter, and if you show proof at the time of the ticket then the Court would most likely dismiss with costs (potentially) or substantially reduce the ticket. In either case a tabs ticket is a non-moving infraction.
The correct statute for phot tickets is RCW 46.63.170 and you can access it here: http://apps.leg.wa.gov/rcw/default.aspx?cite=46.63.170
Additionally, photo tickets do not go on your driving record and are treated like a parking ticket; therefore, they will not have an effect on your insurance.
It is a requirement pursuant to IRLJ 2.1b4, that appears to be mandatory, but IRLJ 3.1d specifically talks about sufficiency and that there must be prejudice for it to be insufficient.
That being said it depends on what court, whether there is a prosecutor there and whether you decide to hire an attorney. I would recommend that you consult one to be able to make a reasoned decision about how to proceed.
Usually worth it to hire an attorney because your insurance rates will be affected for three years of change to your premium. Therefore, you could call your insurance company anonymously to find out the approximate change to your premium based on the change to your record and calculate that times 3 years.
The answer is yes; however, you must be prepared when you appear in Court, so you must bring some form of recognized proof that this road is in Snohomish County.
The Court rule you should then cite is both IRLJ 2.2(d) - that the officer must file it in the correct jurisdiction and IRLJ 2.3, venue, that if it's not brought into the proper Court then it shall be dismissed by either party without prejudice.
Having an intermediate license does not stop your son from being eligible for deferring the traffic ticket. Some Courts could require his deferral period to be longer (newer driver) or to attend a traffic school. However, since the deferral option is discretionary to the Judge, some Courts don't allow deferrals at all (rare), and if this were the case it still wouldn't matter about his intermediate license.
His best course of action is either deferring this ticket or hiring an attorney (...