You're exactly right about what the law says. BUT, the law does NOT say that if you HAVE a laser diffuser, that you must STOP HAVING IT. You can turn it off (or take it out if you wish), but you do NOT have to remove it. You just can't USE it or attempt to use it. And you can't install it AFTER 9/1/11. This is a classic example of ex post facto laws - the government cannot criminalize something that was legal when it was done - like, in this case, buying a laser diffuser. Using it later, however, is a different story. They CAN criminalize that.
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