Whilst owning a laser pen is not illegal, if a person had one in the street and was using it (or intending to use it) to shine in people eyes, at cars or aircraft etc. then they would be committing an offence and, in the case of cars and aircraft, a particularly serious offence. They may also be personally liable to a Community Protection Notice for anti social behaviour, namely unreasonable behaviour of a persistent or continuing nature which has a detrimental effect on the quality of life of those in the locality.