Just follow the delivery guy (as if it were that easy)!

I was thinking the other day when another terrorist video was aired by the Al Jazeera TV station, how did the tape get to the station? If some guy dropped it off, why don't international authorities just follow the guy and see where he goes? If it was mailed to them, I'm sure there's a way for them to trace who sent it. This would at least point authorities in the right direction of finding the bad guys out there. Of course, the bigger issue is why the station has such good "contacts" with the video producers that they always get a copy to air (and why they do anyway), but since it's rainy outside, I'm too lazy to type anymore. Sorry, but that excuse will have to suffice today.