"Rookie officer" joke

A detective is mentoring a blonde rookie officer and decides to give her a challenge. So he gives her a mugshot of a suspect turned to one side and tells her to see if she can give details about the suspect just by looking at the picture. The blonde looks at the picture and immediately says, "
He wears contacts."
Confused, the detective looks at the mugshot and since he can't tell that the suspect wears contacts, he tells the blonde, "
Look, don't give me dumb guesses, this is serious."
The blonde says,"
I'm not guessing. I know this guy wears contacts."
Losing his patience, the detective says, "
Look, quit playing around or I'll have to report you."
But the blonde firmly insists, "
I'm telling you, he wears contacts."
Frustrated, the detective decides to prove her wrong by asking the officers for details about the suspect. A few minutes later he comes back looking both shocked and amazed. He says, "
You're right! He does wear contacts! How did you know?"
The blonde looked at him as if the answer was obvious. "
Well, since this guy has only half a face, I imagine how hard it must be for him to wear glasses."