If possible how do you get time credited for a discharged state sentence?

The BOP will not give credit for time credited against another sentence. This is an issue that should have been raised at the federal sentencing.

What’s the offense for opening someone else’s mail without permission?

Although I am sure you are mad, no one is going to prosecute your grandma.

So you go to jail because I commit a crime? Only if you had something to do with it.

Texas law allows a felon to own a shotgun in their home after 5 years but federal law doesn't. Will they prosecute me for this?

If they catch you with a firearm, they are likely to turn you over to ATF which will prosecute you.

Imitation narcotics a crime?

Yes it is a crime to distribute fake narcotics, claiming they are real.

Should my 16yr old plead guilty to 10yrs doing 85% or go to trial to aim for 10yrs doing 20%?

It is not going to help you getting "advice" from attorneys who know nothing about the case. Whether he should plead guilty or go to trial depends...

As it turns out, all 50 states are part of a single country and they all extradite to the other states. In other words, every state extradites to...

How will it be determined if my son has a federal detainer where will he be held when he is released from state in Little Rock A

The detainer means he will go into federal custody once he completes his state sentence. The Marshals typically have contracts with local county...

It means his request to be released was denied.

There is no way to reduce a federal felony to a misdemeanor after the conviction.