I find this suggestion to be forward thinking. People just want to help. Not just locally, but from far and wide. Submitting samples to add to the growing DNA database for any current or future case or cold case would have far reaching benefits.
This reminds me of the pleas from, say, Am Red Cross in times of crisis for blood donations - both locally and nationally. It allows citizens to contribute indirectly but very effectively.
Great idea,
@Bruxer !
Edit to add: I am referring to labs such as Othram that will accept donated specimens for database.