Where is water coming in at on drivers side floor when it rain

Hello, water can get inside anywhere there is a body seam, but the places I typically look first are: Does your vehicle have a moonroof? If so, the drains could be detached or clogged, causing water to find a way inside the vehicle. Has the windshield ever been replaced? The seal may be incomplete, causing a leak Beyond that, water testing around the vehicle is needed to find where it could be coming in. (must be done anyway, but likely related to the areas I mentioned.)