He used this ability to help the police solve crimes.
But the police cannot solve the gang problem alone.
The Commissioner said the city was offering a $10,000 reward for information that would help the police solve the murder.
Five years ago the police solved 84 percent of serious crimes; the rate fell last year to 50 percent.
Now, he said: "The police, the courts, the security services don't solve a single problem.
"The police can't solve all crime by themselves," he said.
The most honest experts had said from the beginning that the police would solve the case with tips, not profiles.
Prosecutors also strongly criticized him for not helping the police solve the killing.
And then when the kid gets in trouble, we expect the police to solve the problem.
He added that the police alone cannot solve or "even have a significant impact on the crime unless the community is involved in the effort."