Identifying a particular laser
Police aircraft carry spectrographs that can give a very good idea of whether the laser the scrote is arrested with is the one that was shone at the aircraft, if everyone has the time and inclination.
Last night travelling home through Frankfurt I had the first laser I'd seen shining at an aircraft I was on as we approached - a very bright green flash from south of the river west of the city that definitely got the overwing exit window. I saw it coming as a flickering green light, and then whack!