You can have him arrested for back child support, at least in MI, I don't know about WA.
Because of the lies, I wouldn't even try to bring up past drug charges. I would just try to document all the times he calls and cancels. Write down time and date and as much of conversation as possible. Mine, I had a protective order against because he threatened to take our son over the phone, and he hired a former district attorney and had the charges dropped by lying. By the time all was said and done, my record looked like I was the violent one and not the other way around.
Document everything. If he isn't involved, he's just trying to make your life more miserable than it already is. The more these type of people realize they are losing control over you, the more they cause trouble.
I hope your court session goes well for you.
Careful what you wish for, you just might get it!