2000 1500 leaks in driver floor

i have a 2000 1500 silverado ext. cab and when it rains it has developed a leak in the drivers floor. i looked all around the door seal and i can't see any problems. has anyone else had this problem or any soggestions on where it may be coming from. thanks!

are you sure that it is not the windshield leaking, and running down behind the dashboard?

do you mean the silicone seal that holds the windshield in place or another seal at the windshield channel? thanks for reply and help.

well, it could be along the windshield where the glass seals in...it would be VERY odd that a newer vehicles like that has a floorboard leak...i would crawl under it and look for any kind of body plugs that may have come out or loose...