Honesty is always the best policy to follow and if everyone was honest our society would be a much safer place to live. Both prosecution and defense attorney’s have ethical obligations that they must follow.
Both the prosecuting and defense attorney are ethically obligated to both of the following. First they must always give the courts only the truth, neither should ever intentionally give the court false information. Next they both must always turn over all evidence whether bad or exculpatory in a timely fashion prior to trial. Both of the following items apply to the defense as well as the prosecution. This will always help to ensure a fair trial for all parties involved in the trail(s). Another obligation that both sides shall always follow is to inform the court if a client/witness intends on committing a serious felony wherein a person's life is at risk. There may be some cases in which emotions are running very high; a great example of this would be a murder case. Take for example that a parent is looking to get revenge on the murder of their child. On the other side if the defendant is out on bail and is looking to harm a main witness to the prosecution to aid in their freedom as an end result. Attorneys are also obligated to not allow a witness to intentionally perjury him/her self.
All of the above obligations are in place to ensure that all trials are fair and that they are all safe to everyone involved. This is what is expected of all attorneys’, although most abide by these there are those who give the best a bad name and chose to fight dirty.