it could be done once for your area every couple of years and sponsored by, say, your state bar association. It doesn't have to be done with every case, and it wouldn't replace private detectives in big cases and other deep dives, etc..
On the whole, it would be relatively to very inexpensive for a region...say The Bronx to do this once every couple of years.
You can't read everyone correctly, and when you weren't sure, you and the prosecutor would have somethin better than chance to fall back upon.
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