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MultipleParadox has it down. The only thing I'd add is the frequency doubler crystal in cheap green lasers may be too small/not properly heatsinked and can drift quite a bit in frequency which will lead to permanent damage of cheap IR filters.
In Edmonton we do not allow green lasers as we cannot guarentee 'high quality'. I personally use a red laser only for designating buildings (The shots were coming from that {light it up} building), never for actually aiming at people.
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