Lawyers for the city begin calling witnesses Thursday in the federal trial challenging the NYPD's stop-and-frisk policy.
City lawyers showed a police training video that aimed to demonstrate the different ways to determine if a stop should be performed.
This includes how to gauge suspicious activity based on how someone is walking.
On Thursday, a former commanding officer of the police academy testified about the different methods used to train officers regarding concealed weapons.
"Because officers know every day what it's like to carry a gun when someone is carrying a gun and they're walking in a strange way or in a unique way that's characteristic of carrying a gun the officers are then able to see something that the general public is not able to see," said Heidi Grossman of the City Law Department. "And that's why have to rely on our trained police officers to know when there is reasonable suspicion and when someone poses a danger and when a stop is justified."
Lawyers for the plaintiffs argue police are disproportionately stopping innocent black and Hispanic men.