i've read a fair amount of posts concerning crowd scanning here and,even being from the u.s where it is pretty much forbidden,i know it can be done responsibly.
i read one post refering to having seen crowd scanning done w/ 40w lasers.
this video shows a really nice looking six watt system.
http://video.google.com/videoplay?do...arch&plindex=5
even if i were operating in unregulated lands i would pause at this level of crowd exposure.