First -- I'm not a lawyer. I don't play a lawyer on TV. If anything in this post looks like legal advice, you've clearly made a mistake. I'm not qualified to offer legal advice.
Second -- I have fought a ticket in this state, with limited success (91 in a 60 argued down to 70 in a 60 in a Kangaroo Court).
Which county?
Were you actually doing 37?
Did your radar/laser detector go off?
What kind of street was it? Go back to the scene and take pictures, make notes, look for anything useful. You may be able to find high voltage power lines, billboards, etc. that could have caused radar interference (assuming he's claiming a radar speed).
RCW Title 46 has a lot of useful information. It should be noted, btw, that none of the normally applicable Constitutional rights for criminal offenses apply, as this is a violation of code, not a violation of law. Bigger difference than you might think -- that means they only have to make a vague pretense of legal proceedings. Justice is non-applicable, and revenue is king. But I'm bitter...
Anyhow, I'd contest it, simply on the grounds that it makes the system work. Plead not guilty and send it back in. Start drafting up a request for continuance, if you feel you're going to need more time to collect evidence. You should also write a request for discovery to get evidence from the officer (per se). The stuff you're looking for is training records, radar certification, the officer's copy of the ticket, his statement, that sort of thing. I've heard of cases where the whole offense was tossed out because the gov't failed to provide all requested documentation under discovery.
(sigh) I could go on, but it's probably moot. You're going to fight it, and you're going to lose. You could hire a lawyer, which would cost, perhaps $500, and he may have a better chance of success than you do. Ultimately, the system isn't concerned about justice, it's concerned about revenue. At least fighting it makes the system work for it's money, rather than you just handing it over.
Good luck,
Dan