Test case for RSA t-shirts

[I posted this to comp.org.eff.talk but got virtually no response, maybe someone here can make use of it] In July I'll be going to the US for a conference. I have one of Adam Backs RSA-in-perl t-shirts and am prepared to wear it into (and possibly back out of) the country if anyone feels it would do any good (for example to act as a test case for exportability). If anyone thinks this would be useful or wants to offer a legal opinion, let me know. For something less trivial, I can also carry in a disk of crypto code or something similar (say, 20 pages of DES bar codes) and see if I'm allowed to take it back with me. Peter.