The Collaborative Practice process does not guarantee you that every asset or every bit of income will be disclosed, any more than the conventional litigation process can guarantee you that. In the end, a dishonest person who works very hard to conceal money can sometimes succeed, because the time and expense involved in investigating concealed assets can be high, and the results uncertain.
You are generally the best judge of your spouse or partner’s basic honesty. If s/he would lie on an income tax return, he or she is probably not a good candidate for a Collaborative Practice divorce, because the necessary honesty would be lacking. But if you have confidence in his or her basic honesty, then the process may be a good choice for you.