Yeah, and to correct some nonsense in earlier posts:
No, the defense is not allowed to lie" The defense is not allowed to make things up. The type of scummy defense attorney typically appearing in TV fiction would likely get disbarred within a week.
The defense can certainly present its own evidence, but otherwise its main angle is showing that the prosecution's evidence just isn't as strong as it sounded in the opening statement.
Lie to the court, get tossed in jail for contempt and get your law license suspended/yanked.
Suborn perjury, and now you've got a serious criminal charge on you as well.
(I submit the notion that defense attorneys have to lie to win cases is part of the anti-defense bias I mentioned, a bias which contributes to the list of difficulties faced by the defense).
The defense's job almost HAS to be easier. When the State throws it's full weight behind a prosecution, including an almost limitless budget, the defense MUST have an advantage or it would always lose.
What?
The defense
does almost always lose.
But really, you cannot logically draw any inference from the rate of success or failure alone. If the government routinely brought garbage cases just to give it an old college try, they'd lose a lot. That wouldn't mean that the defense had an easier job in some structural sense, it would just mean that the DA"s office is making poor charging decisions. So success rate could just as easily reflect the strength of cases the prosecutor chooses to bring. Or it could reflect any other number of things.
In reality, the cases where guilt is most obvious get plead out. (A ton get plead out since a poor person will be stuck in jail awaiting trial for
longer than the sentence they face if they plead, so they plead just to get out earlier). The cases that are closer to the line are tried because neither side wants to plead. The prosecutor wants the biggest conviction they can get on their record and the defendant wants to try for acquittal. And in that context, again,
the defense almost always loses.
The only situation I'm aware of that is different appears to be OUI cases in MA. For some reason, defendants appear to have great success rates there. Maybe it is in part because, as someone pointed out, quite a lot more people than are willing to admit it have driven drunk and feel for the defendant.