How should somebody who has developed samadhi verify that rebirth occurs after death? I am trying to understand how somebody following the dhamma is supposed to verify what the Buddha said about rebirth. In the past I've been told that once somebody has developed samadhi/calmed the mind to a great extent then they will be able to see that rebirth occurs after death. 

Usually samadhi helps along the path by making it easier to observe thing and see the world as it is. It's clear how this helps to see anatta/anicca/dukkha, but I do not understand how samadhi helps with seeing anything related to rebirth. I don't know what anyone would begin to observe to see rebirth.

This question has a very similar title to my previous question but it is not a duplicate. In the previous question I had one idea on how someone could verify rebirth occurs after death but the answers said that my idea was incorrect. This new question is asking for other ideas on how someone can verify rebirth through experience.
Go into a very deep samadhi. Very deep.

When in that very deep samadhi, make a subtle mental formation arise. Observe.

Notice how with the arising of the mental formation, awareness comes to be. That very same awareness is consciousness. Within it is the subtle sense that feels the mental formation.

Let the mental formation cease by going back to deep samadhi.

Notice how with the ceasing of the mental formation, awareness goes away. That very same going away of the awareness is death. Within it is the absence of the subtle sense that feels the mental formation.

The way to get additional insight about this is to go into a very deep samadhi and arise a VERY pleasant mental formation. Observe.

Notice how with the arising of the VERY pleasant mental formation, awareness comes to be. Within it is the attachment/craving for that pleasant mental formation. As long as craving/attachment is present, the mental formation is there and the feeling is pleasant and awareness is present. That very same pleasure is "being alive".

Now, don't let the VERY pleasant mental formation to cease, but crave for it to maintain it. Crave for it! Want it! Sooner or later the pleasant mental formation will cease by itself. When it ceases, as long as there is craving/attachment for that pleasant mental formation, the feeling is unpleasant and awareness is present. That very same unpleasant feeling is "fear of death". The cessation of that very same unpleasant feeling is "death".

Now, don't let the craving/attachment for that pleasant mental formation to cease, but crave for it! Really crave for it! Want it! Sooner or later the pleasant mental formation will arise by itself. When it arises, as long as there is craving/attachment, there is also the pleasant mental formation and the feeling is pleasant and awareness is present. This very same pleasure is "being alive".

The wisdom you'll gain by experiencing the above is that awareness consists of many little formations arising and ceasing with high frequency, thus making it seem that consciousness is steady and pleasant. In individuals who don't practice the dhamma, there are so many of these formations, that even if you shut off all your body senses (eye, nose, tongue, ear, body, mind), they would still be arising and ceasing. These formations can be dependent on your body or independent of the body. Impossible is to know exactly. They can come from deep within you. It's like a spider web that has no ends. It's these formations that condition other formations until the center of the web is created: your physical body. 

With the death of the body awareness ceases similar to going into a deep samadhi, and craving/attachment "fear of death" is present ... this very same craving/attachment responds/reacts to the many little formations, thus creating new formations and rises the awareness because of the many new formations until a new body is created.

This must be experienced. It's the only way to verify that rebirth occurs after death.

Once you get the above insight, it's simple to follow a logical conclusion: 

By wishing/acting/deciding/doing we're doing activities that create formations.

By activities we create subtle senses and come into existence. Then, because of our further activities, we create the senses of our body (eye, nose, tongue, ear, body, mind) and we're born.

By gaining knowledge we are changing our current activities and creating new activites.

When we're changing our current activities and creating new ones, we're also changing our first activities that we acted upon that propelled us into this existence.

With the dead of the body our activities on the surface (eye, nose, tongue, ear, body, mind) are destroyed. And what remains? The primary activities that are changed.

Because these primary activities are changed, after death we will come into a new existence that will be changed too.

Thus, there is no death. There is just the changing of awareness from one existence to the other due to activities. This process is constantly happening ... even now in this very same moment. It will happen as long as craving/attachment is present.

Then, the logical way to continue the path towards the ultimate would be: When craving/attachment stops, all activities stop and suffering stops. Thus, the next step is to stop craving/attachment.