Since 2012, the US has had a fairly tough law in place with penalties up to 5 years in prison for knowingly pointing a laser device at an aircraft. It is now estimated by the FAA that there are an average of 11 incidents per day in the US alone.
We carry a version of this, originally created by the UK's CAA (PDF):
Aviation LASER Exposure Self-Assessment
FAA publication on the hazards of L.a.s.e.r. attacks:
LASER HAZARDS (PDF)