Is it legal for City, State, or County to charge interest on top of imposed fines?

Yes they can impose both a surcharge and interest.

A woman claims she witnessed a crime and she was not present on the scene now my husband is serving a f3 for something he did

Did he plead guilty or did you have a trial? If he was recently sentenced, you may still have an option to appeal. You should contact an attorney...

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Yesterday in court I was denied the opportunity to present my facts and evidence in a restitution hearing.

Restitution hearings deal with the crimes you already pled guilty to, the Judge was correct when he informed you that a Restitution Hearing is not...

Can police add aditional charges?

To add to the answer above, yes they can charge you and if they do, possession of mushrooms is a 3rd Degree Felony.

What is the liability of the courts and religious non profits when they negotiate freedom for offenders, then cover up crimes?

You need to contact an attorney in Iowa where this took place. It is unclear what your ultimate goal is, however, one of the first things you need...

I am being charged for stolen gold I did not know it was stolen I bought if off the street pawned it later on .

Unfortunately knowledge that the gold was stolen is not an element of the crime you will be charged with. You may however have some defenses...