Identity theft is the first thing that comes to mind.
The other is that you're a troll implying that your kid is buying drugs via Western Union transfer, which is pretty ludicrous--Mexico, Panama, and North Carolina being reasonably well-known drug source areas.
Or there's porn or gambling involved.
Or the kid just made some friends in chat rooms and is a soft touch for a con.
Or the kid is buying spanish lessons from natives and/or illegal aliens in NC.
Or he's making big-hearted donations to charities to feed hungry children.
Or he's supporting missionaries.
Or they're not strangers to the kid. Maybe he's loaning money to friends on vacation who are paying him back.
I had a friend get raided by a federal agency once. Seemed they noticed something suspicious getting shipped to his house, looked and saw he didn't have a license for a related item that they thought he would have had if it were an "innocent" transaction, and assumed he was Up To No Good. Didn't help that they were looking to gin up publicity for congressional appropriations and the friend is rather famous.
Turns out he was accepting a mail delivery for a friend who was on vacation and wasn't going to be home to receive it--who *did* have the proper licenses for the related items---and it was all legal, innocent, and perfectly legitimate.
One of those things that looked horribly damning, and if he couldn't *prove* it was innocent people would have said, "Yeah, right." But it actually turned out there was a perfectly innocent but non-obvious explanation.
On the minor off-chance that you're *not* a troll, you might want to ask your kid about it, as the other poster suggested, before jumping to horrid conclusions.
Timoclea