xanex18

My 05 shinka is leaking and I was trying to track it down the other day. It isn't coming from the tail lights which was my first guess. It isn't coming from the sunroof drain in the fender. It looks like it's coming from further inside the fender cuz it leaks into the trunk and into the backseat on the passenger side. I thinking it might be the rear glass but I don't know how that would be leaking like that or how to narrow it down any further. Anyone have any tips on tracing out leaks?