Observation is the key

In a job interview for policemen the applicants are shown a profile picture of a man, and the interviewer says, "The job that you're applying for requires powers of observation.  Make one observation about this man."  

The first applicant enters and says, "This man has just one ear."  
"Get out!!" screams the interviewer.

The second applicant enters and says, "This man has one ear."   
"Get out!!" screams the interviewer again.

Then the third applicant gets up to go in for his interview. The first two guys are out there and they tell him, "The guy that's giving the interview doesn't like to hear that the man in the picture has one ear."
"Thanks for the tip" says the third applicant.

So the third applicant enters, stares at the picture for a while and finally he says, "This man wears contact lenses."
The interviewer is impressed and says, "Excellent observation. Tell me, how could you tell?"  
So the guy says, "Well, this man has just one ear, how could he wear glasses?"

Thanks Mickie