The money was still in the purse...?
So...I realize the film doesn't address exactly how the real crime took place, or who went where afterwards...but I was surprised that the attorney didn't point out that when the purse was recovered on the other side of town, it still had $1,200 in it.
Because not only was it unlikely the teen would have gone all the way over there to discard it, but why would he have left the money in it?