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Many police departments still use DNA evidence the way they have used fingerprints and tire tracks: to determine whether a suspect committed the crime.

Asking questions is an essential part of police investigation. In the ordinary sense a police officer is free to ask a person for identification without implicating the Fourth Amendment.

Any street cop knows you will be sued or involved in some type of litigation throughout your career.

If any person - white, black, brown or yellow - objects to having a police officer potentially ask them for their ID, it makes me wonder what that person is trying to hide.

Pauley Perrette: I was a criminal science fanatic and went to study it in college as well and I think that helped me on NCIS because I was comfortable with the language, I had studied criminal science in school for years.

I don't necessarily have friends who are forensic scientists, but I have tons of friends who are cops.

Police forces collect information to be used in a public court to get people convicted. Security services gather information that does not necessarily lead to people being prosecuted and in many cases needs to remain confidential.

If your neighbors think you're a detective because a cop always brings you home, you might be a redneck.

I'm sure they're investigating everyone who was in the area.

Yes; we have a specific procedure which we follow in all cases where the Agency is in contact, for the purposes of acquiring intelligence or whatever the case may be, with an individual.