So you officers will understand that what we are doing is for their own benefit.

"We think the high-ranking officers understand why this has to be done," he said.

He couldn't stay around to see if the Egyptian officer had understood him.

Although officers understand that rationale, many still do not like it.

"I want to make sure police officers understand they have discretion to go ahead and do that," he said.

Indeed, a serious problem within the force is that many officers, who come from 14 countries, can barely understand each other.

"Military officers, more than anybody else, understand the use of the visual arts."

You also say these officers don't understand that "their first job is to earn the trust of citizens."

That didn't necessarily mean the officers in question had actually understood their instructions, however.

City residency also helps officers understand the communities they work in, experts say.