NYPD Collision Investigation Squad gives behind-the-scenes look at how they investigate hit and runs, deadly crashes

QUEENS, New York (WABC) -- The NYPD gave Eyewitness News an exclusive, behind-the-scenes look at the technology being used by an elite squad, tasked with investigating hit and runs and other deadly crashes.

Officers within the NYPD Collision Investigation Squad have the best point of view to piece together how disasters unfold on the roads.

"That chance encounter leaves somebody deceased and that one vehicle that fled that scene - we have to kind of put them back there," said Lieutenant Jag Singh of the NYPD Collision Investigation Squad.

It's the tedious work of the squad; gathering video, using sophisticated tools to recreate a collision and determining how fast a vehicle was going by the size of a skid mark.

"That vehicle can go from one location to another county, to another state