Ok Every time it rains i get water in my back seat and in the rear floor area. I cant figgure it out. I've sat inside my car and had friends spray the car with water. I found water coming in the tail light area and the passanger side window, So i fixed the tailight seal, then i replaced the passanger side door trim and seals. So i thought i fixed it, so today it rains and the backseat driverside has water in it again. All the drains are clear and the hatch seal is good aswell, I'm running out of ideas.

It runs along your hatch lid and then falls on your seats as you open it?

Use to happen a lot to me.

check your sunroof drain lines if you have one, if not it could be leaking around the urethane holding the back window in, or between the welds on the rear quarter and the body. Keep running water on it and look for drips, thats about the only way to do it, its aggrivating but it beats a warm soggy smelling interior. yuk

double check the drain lines in the trunk hatch area and also check on the passenger side of the car behind the inside trunk panel. there is a vent there so it might be leaking through there. Mine was.

trunk weatherstripping? most likely the top of your trunk since that is right above the back seats.. try spraying some water down from the top.

I would look at the seals on the windows. Make sure that they aree not leaking.

Ummm yahh i still cant find where its coming in. I just had a guy i know spray water all over my car for a half an hour and still nothing. Maybe it was residual water from before i fixed the tail lights.

pull up the carpet and check to see if all your rear drain plugs are in, and check around the antenna, possibly the gasket around your rear spoiler?

I'm thinkin the rear spoiler as well. I had the same problem last year, except mine was bad enough to run all the way up into the driver's side foot area, and completely ruined my carpet and back seat.