Why would he lie about this, in order to stay in an extra month? Sometimes the inmate release date changes slightly for a variety of reasons. If he is lying about this, it might say something about the relationship

The only way you'll know is if your inmate tells you. You cannot get a copy of or information regarding to any of the inmate's visiting list, call list, commissary spend, or people that send your inmate money or mail. Believe it or not, inmates have a right to privacy just like you.

Not going to happen. The inmate is entitled to full privacy - their visitation list, call list, commissary money whereabouts, and what was spent are fully protected. 

Unfortunately, you already know the answer to this one.  Your loved one is still using and no matter how they appear most of the time, those unexplained absences are explained when he violates (as a result of a UI or other tests). The only person that can change is the person using - they have to want to change or nothing will change.

If you are asking how to get an inmate to take a paternity test. We assume you're asking because they won't do it voluntarily - you will have to get a court order that compels the facility to release the results of the DNA test for that person, that is done on all inmates.

There is not much you can do about your suspicion except ask your GF. There are no guards that will violate the rules and communicate what transpires inside the prison. If you know another inmate, maybe they can help you. But if you suspect something, it probably is happening. We wish you the best.

They BOTH wish!!! Hell no, it's all segregated by sex or there'd be a lot of prison babies :)

No, unfortunately, there are very few prisons that allow for conjugal visits anymore.

You know this question could be answered either way. "Yes, he might be", or "no he really cares". Let's assume he likes talking with you and seeing you at the visitation. He likes that you are showing him attention. There is a chance that this relationship can grow beyond where it would have if he was out. Maybe you get to know each other better and he becomes more into you. Life is too short, you have to let this play

Sometimes the CO that is requesting him to visitation will tell them who is there to visit (especially if he asks). If he doesn't want to visit, maybe you should write to him first to smooth things out before you visit.