So, when tourists enter the US, do they need permission to leave with souvenirs? It depends on the export restrictions. A couple of decades ago, if your "souve

So, when tourists enter the US, do they need permission to leave with souvenirs? It depends on the export restrictions. A couple of decades ago, if your "souvenir" was a device capable of encrypting data with a key larger than a few dozen bits, yes, you would need permission to leave with it.