The expertise needed is high, with suspects frequently using coded language.

The police theorize that the suspect may have used his place of employment as a base to look for potential victims.

It was not clear what kind of vehicle the two suspects, described as being in their 20s, used to get away.

The suspect used the crook of a tree to steady his aim as he shot, investigators said.

The suspect used a knife to force the women into an apartment, and he tied them with tape.

The suspect used the phone to talk to the police until its battery died a short time later.

Grissom realizes that the suspect used one of these hands.

The suspect had used his own passport and driver's license for proof of identity.

They are also provided with suggested physical and verbal responses that a suspect in a real case might use.

The photographs were taken when the suspects used a stolen credit card to buy clothes, the police said.