Synopsis:
In the first half, a defense attorney tells us why we should never talk to the police. He describes in detail how everything that you say, no matter how innocent or useless, will be used against you. He also describes how everything that you say actually CANNOT BE USED TO HELP YOU. (All evidence that would help you will be considered hearsay and thrown out.) Note that he talks extremely fast and its a bit hard to keep up with him.
In the second half, the defense attorney invites a police officer to speak about the subject. The police officer describes how he routinely deceives his subjects to obtain convictions.