A relative of mine has one of these which has a 25 mile range,with a distinct fine,but powerful beam which would be seen for miles around at ground level,and is used as a pointer in astronomy to point out particular stars etc.
In responsible and educated hands,who understands flight paths of civilian aircraft,and only used on crystal-clear starry nights.with no wind,so even the furthest-away aircraft can be either seen or heard,this is a valuable tool,but even after all that,I cannot help but think they should be either banned,or restricted and licenced to those who can show justification for requiring one for personal use.
One such night,a while ago,my relative was out star-spotting alone in the garden,in the early hours of the morning,and while momentarily testing the laser-pen out by flashing it quickly,in very short bursts,she was terrified by a whirring sound behind her back,and upon looking up,saw a strange craft hovering over the house-roof at a very low height.
After a few seconds,the strange-looking craft turned slowly and just whizzed out of sight.This story has been covered in another thread,if my memory seves me correct,and whether it was a military stealth craft or an alien craft makes no difference,it is obvious that the reason it appeared was to recon the source of the laser.
In the wrong hands,they are deadlier than a shotgun....i.e...the potential for disaster on a much greater level is present.
Do we really need them even for instructional purposes?....what was wrong with the good old-fashioned stick?...it was alright in my hands on syndicate work on courses that I attended!!