An instructor at the New York City Police Academy has been stripped of her gun and badge, police officials said, for giving insufficient training in CPR to a class of recruits that included Peter Liang, the officer convicted last month in the fatal shooting of an unarmed man in a Brooklyn housing project stairwell.

The instructor, Officer Melissa Brown, who is part of the Recruit Training Section at the Police Department, was put on administrative duty this week as the department continued to scrutinize its CPR training program, police officials said on Tuesday.

The inquiry grew out of testimony about training lapses during the trial of Mr. Liang, who was convicted of manslaughter for killing Akai Gurley during a so-called vertical patrol in 2014. He was also found guilty of official misconduct for failing to help Mr. Gurley as he lay on a fifth-floor landing.

Mr. Liang and his partner, Shaun Landau, who were both fired after the conviction, testified that they were given answers to CPR exams at the Police Academy, from which they both graduated in 2013. Mr. Landau said he had received about two minutes of CPR training and never read the textbooks he was given.