I believe Rick Collins' book addresses legality in different countries, doesn't it? Or has he only written it for the U.S. only? I need to get that book...
Obviously, you can't take pins with you on the airplane--they won't allow it. I went to Brazil to visit family down there and had a prescription for methyltestosterone (brand name android) in pill form for the time I was there. Of course it is different with me since I have a valid medical use for it, but I didn't have any trouble with customs either direction. I suppose if you did have a prescription, you'd be okay.