Supervised probation and maybe a little jail time.

What will happen?

Enough is enough - when she stops. If they find more she'll get arrested again. You need to get her into counseling. Asap.

They can hold him until the charge is disposed of. Or until he posts bond.

I am being charged for a check that I didn't write.

So get a lawyer. You'll also need a handwriting expert.

You can't be guilty of "possession" just by "consumption". I tried a case like this years ago. Get a lawyer.

If I'm having problems with my public defender what can I do

Sit down with your lawyer and work out your issues.

Is there a law in Missouri that states a defendant can not get a greater sentence than their codefendant?

There is no such Law. Jailhouse lawyers are nothing more than jailhouse lawyers. Tell him to ignore those guys.

About how much prison time will someone be serving after violation of parole with an additional mistemedor?

It all depends on the judge and other factors. His probation could be revoked.

Could my case possibly get dismissed?

Anything could happen. Talk to a lawyer. There are a number of crimes you could be charged with. And the penalties vary greatly.

Moving out?

You're an adult In Missouri at age 17. So you can leave.