I have known for a long time the Sheriff, Chief Deputy and most of the captains in my local County Dept + they know I understand the Chain of Evidence. I have offered to help them anytime and I get a nice pat on the head and am told they have a machine sitting in a closet somewhere if they ever need one.
I also have a close relative that is a senior game warden locally who I have offered to help teach him his machine (Whites DFX) so the first time he uses it, he wont have to study the manual via flashlight. Same response, tho he was interested in the concept of a pinpointer for locating poacher bullets in carcasses.
Horse to water, and all that.....