A comprehensive resource for safe and responsible laser use

Canada: UPDATED - Police helicopter forced to land after repeated Class 3A laser attacks

A Durham Regional Police helicopter was forced to land after being repeatedly illuminated by a laser, later determined to be Class 3A (maximum power less than 5 milliwatts). The maximum power allowed to be sold as a pointer in Canada is Class 3A.

The April 21 2012 incident happened in Uxbridge, 75 km northeast of Toronto. It was looking for vandals when struck by a laser numerous times over several minutes. The helicopter set down at a nearby police station, and the pilot was taken to a hospital. He was released with no apparent damage, but a police spokesperson said it could take several days for damage to emerge.

20-year-old Melissa Perry of Uxbridge was arrested, and charged with lessening the ability of a crew member to perform duties, interfering with the duties of a crew member, projecting a bright light at an aircraft, mischief endangering life, assault with a weapon and common nuisance. It is unclear from news reports whether Perry was associated with the vandals.

From DurhamRegion.com, Global Toronto and Canada.com

Analysis from LaserPointerSafety.com: If the laser is really Class 3A (less than 5 mW maximum power), the pilot’s eyes were unharmed. The Nominal Ocular Hazard Distance for a 5 mW laser with a tight 1 milliradian beam is 52 feet. This means that laser safety experts have concluded that no eye injury could occur past 52 feet. If the pilot was airborne, his eyes were likely much farther than 52 feet from the laser. (Global Toronto reported the helicopter was at 5000 feet, but that is very high for vandal surveillance; 500 feet is more reasonable.)
Plus, as explained on the Laser Safety Calculations page, there are additional factors that go into the NOHD. The result of these factors is that a 5 mW laser would have to be within 16.4 feet of a person’s eyes before there was a 50/50 chance of causing a minimally detectable eye injury. This is not opinion; this is scientific fact based on how the NOHD is derived.

UPDATE, NOVEMBER 2012: On September 21 2012, Perry pleaded guilty to one charge of violating the Aviation Act by shining a bright light at an aircraft. She was fined $500. All other charges were dropped by the Crown. From DurhamRegion.com.