water leaking into car thru ceiling? coming in in front of the side roof rails

What is your question?

the problem is getting worse. water leaking in to vehicle through ceiling somehow. is there a way that the water could be coming in in front of the side rails, there is a plastic strip inside of the roof line on the outside of the car.

What makes this problem better or worse?

of course when it rains

How long has your 2012 GMC Terrain had this problem?

approximately 1-2 years, getting worse