I'm sure most of them are caught by xray, or by hand inspection. I know AUS has been getting more and more thorough last i'd heard. the US is starting to get aggressive with it too. The days of handheld lasers are dying down now as more pilots and similar operators complain, and people go waving them around. In fact I think the US is the only country I can think of that even allows pointers of class IIIR, and cops are smug trying to tell me that they can take my pointer away from me sometimes. it drives me nuts, I've had arguments over it before and had to show them the CDRHs before to get them to leave me alone. as long as I'm not purposefully aiming it at people its not dangerous at class IIIR. most places are limiting things to <1mW now. not that I ever advocated carrying high power pointers in public anyway, but its a mylti-faceted problem, where once it was a "you can have it in the confines of your house only" kinda thing, and now its a "nope" before even asking questions from multiple sources regardless of what is written. disappointing - and not everyone has the time and money to learn how to make the good stuff, presuming you can even find parts. most of the time I hate to admit that I can buy a professional laser for cheaper than making it in many cases. and OEM parts-be it modules, diodes, crystals or other stuff are marked up because the company wants a part of whatever you're making. if you're even allowed to buy it at all. Technically individuals aren't supposed to be able to buy parts anymore. it's part of why MG doesn't sell single units anymore really, and when they do they cost a fortune.