In the wake of the Peter Liang trial, the NYPD has opened an investigation into CPR training of officers in the department.

Police Commissioner William Bratton says after Liang and other officers testified in court that they were insufficiently trained in CPR, the department began conducting an internal affairs investigation.

"So under no circumstance will we tolerate any officer in the New York City Police Department short-circuiting the process, whether it's the instruction itself or the testing itself, to validate that the officers have the necessary skills to safely patrol the city."

Liang, a former police officer, was patrolling the Pink Houses in East New York in 2014 when prosecutors say he recklessly fired his gun, killing Akai Gurley, who was unarmed.

Liang testified his gun accidentally went off in the dark stairwell.

He faces up to 15 years in prison when he is sentenced in April.