A: There is no doubt that people tend to believe much of what they hear in the media. In the case of a high-profile case, it is very important to find out of prospective jurors have heard anything about the case, or formed any opinions. This is part of the voir dire process which basically means to speak the truth.
A: I assume that you are talking about a sobriety checkpoint, and not the police looking for a suspect. Generally speaking, choosing not to enter a checkpoint should not give the police sufficient probable to stop you if the u-turn is a legal maneuver. However, in reality, you will probably be stopped. The police may follow you until to you commit some minor moving violation, of which there are many, and pull you over for that. It is best not to drink and drive. However, if you have been stopped for making a U turn, contact an attorney immediately.
A: If you are referring to probation as a sentence in a criminal case, probation is generally treated as a contract that the defendant agrees to in order to avoid going to jail. For this reason, you are basically asked to live up to the terms agreed upon.