What's the best way to find a lawyer in Tempe, AZ that handles a lot of federal criminal drug + conspiracy cases?

I would check out the district's cja panel for the names. Those panel attorney's focus on Federal criminal cases and are active in court.

Once someone has been arrested and charged, and the case has been sent to a grand jury.

You sure can. Either through a superseding indictment or a whole separate indictment later on. This is where a good attorney can view the...

Felon is possession of a firearm (Federal Charge)

The defendant sure will have an attorney soon with these facts. ACCA and CO enhanements may provide a 15 year MM or max ranges on the USSG chart. ...

What is the process of a state prosecutor offering a witness immunity in AZ?

This is best left as a negotiation between the prosecutor and the defendant's attorney. You cannot broker the deal.

I keep on receiving grand jury notices and when I show up

You have to actually get empaneled to constitute a service. So, you remain on the list until you serve.

I had a package stolen from mail box by a juvenile. My neighbor has the theft on security tape. What can I expect to happen ?

Report the theft to the local postmaster.

If a state prosecutor gives a witness total immunity, can they still be prosecuted in federal court and vice versa?

Yes they can based upon the testimony. This is why you need an attorney to review your testimony prior to any hearing for criminal liability...

BFI is stating that I need to pay back $19, 000 because of my kids father using my address which he doesn't live with me?

Get an attorney right now. You have to protect yourself while assisting the authorities. You cannot do both yourself. Please get an attorney to...

No to the first and yes to the second. Remember, there are many state overlapping laws with the Federal system that local prosecutor can charge...

She may not get a BOP location and just ride it out locally because of the short time. Otherwise, BOP sure does take its time.