um. lasers like these aren't really that dangerous if you take into consideration, pistols, snipers etc. and these in some countries, are not banned. nothing much else to say about it @_@ it's dangerous but not the most dangerous lol.
just a side note.
Air pressured Pistols in HK are a lot cheaper .-. than this thing LOL. if you want something dangerous, consider those pistols. the ones that can shoot metal mini bullets =] they're quite haxxed and dangerous =O
alternatively, just get a real gun, if u're in a country where it is allowed. Over here in Australia, everything is banned. except knives, but even then, if u're caught having one on you without a legitimate reason, there will be punishment.