What to expect? Worst-case scenario would be two convictions with significant jail time. Your making payments on fines helps but is no guarantee. Even if a jury were to acquit you of the new charges, you could still be revoked from your deferred adjudication.
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To begin with, you probably qualify for a court-appointed attorney. That should be your first step: ask the judge to appoint a lawyer to represent you. These matters are often dismissed if you are able to get your license back, but the exact mechanics of dealing with the prosecutor and judge are best handled by an attorney.
This is an offense charged under RCW 16.52.117. I am only aware of civil forfeiture proceedings that are available to the government in drug and fish and wildlife cases, under chapters 69 and 77 of the RCW respectively.
You should look at the provisions of RCW 13.16.085: In any case in which a child under eighteen years of age has been placed in any detention facility under the jurisdiction of the juvenile court, the court may inquire into the facts concerning the necessity or propriety of such child's detention notwithstanding the fact that such child may not have been found to be either a dependent or a delinquent child. The court may, either in the proceedings involving the question of dependency...