Interesting you should mention that. I just read an article describing the situation in the US and specifically California. There were over 2,000 instances of lasers pointed at aircraft in the US last year, and LAX is considered one of the worst airports.
Rising trend of laser-pointing at planes, helicopters | abc7.com
The Feds recently passed a law making the act a felony (roughly equivalent to an indictable offense in the UK) with penalty up to $11,000 per event. We'll see if it has any effect.