Washington law will require suppression of the evidence of your first datamaster reading. However, Washington law also permits DUI prosecution if the state can prove your driving was "affected" by any alcohol and/or drugs consumed. This is typically proven by poor driving, poor roadside tests, and any evidence or admissions you may have made.
Your case is stronger w/o the breath test reading, but its no slam dunk. Hopefully you will get some sort of reduction that will save your license and keep you out of jail.
This will make court. You can be charged on the failed road side tests alone. However, if you hire a bold, savvy, veteran DUI attorney then this will be unlikely to make conviction.
At your service,
I agree with Mr. White on this. Expect to be charged with a DUI primarily because the officer felt he had enough evidence or probable cause to arrest you, so expect a prosecutor to decide there is enough evidence to charge you. It certainly will help that no breath test evidence is available because the law requires two samples.