I'm going to cut and paste a few sections of the law here for you...but here's a page that has the link to the entirety http://www.800bucklup.org/parent/washingtons%20law.html :
(a) A child must be restrained in a child restraint system, IF THE PASSENGER SEATING POSITION equipped with a safety belt
system ALLOWS SUFFICIENT SPACE FOR INSTALLATION, until the child is eight years old, unless the child is four feet nine inches or taller.
(c) The driver of a vehicle transporting a child who is under thirteen years old shall transport the child in the
back seat positions in the vehicle WHERE IT IS PRACTICAL to do so.
We're lucky enough to have both cops and docs in our family, so we get chapter and verse on this. The cops all agree it's fine legally to have FRONT FACING children in the front seat if they're properly restrained. The docs disagree because the heat for the air escaping the airbag can permanently blind children and smaller adults.
What we do is try and rely on common sense. If we have our son in the Jeep (seats 2), we turn off the airbag on his side. If we have him in the car and I'm moving something I don't want to fall on him (like an amp, or heavy schtuff from homedepot) I pull him and his booster up front with me. If I've got 2 fullsize carseats in the back seat I pull him up front with me. He's the biggest, although not the oldest, of the kids we drive around. Even without his booster, the seatbelt fits him hip-hip-shoulder...with his booster he's up even with me and taller then some of the adults that have been passengers of mine...so pure and simple I don't worry about the airbag. This may sound like he's up front an awful lot, but in reality it's about once a month.
Sorry, I've never been able to get 3 car seats next to each other. 2 carseats and a booster, yes....but that also involved a lot of scraping knuckles and cramped fingers!!! Is there a reason why you don't have one or two of them in the first row (back) bucket seats?
~Z.