from what ive heard around the forums is that customs test the power of the laser if it is a complete laser.
It's luck of the draw really. 1000 lasers may make it through customs and yours might be the one they catch.
Certain websites are on a list of known illegal imports and will always have their packages checked. Taking the label off it doesn't help if they test the output.
Hehe well my friend, there is an abundance of information on this forum! its up to you how you use it