Well, I've only been doing this "for real" for about 6 months, but I've had pretty good luck so far.
I try to only talk about it to people who might be in a position to help me, like the local cops or DNR folks but most of them, after the intial check to make sure no one else is listening in on us, have been pretty cool.
Back in early November, I had to give myself a crash course in lifting fingerprints, and went straight to the Mooresville PD to see if I could get some fingerprint powder. They couldn't give/sell me any because it was a cost controlled item, and the captain came out to tell me why, and then we started talking about my reason for wanting to try it.
He wanted to know what I wanted to get prints off of and why, and I told him the pan out of my neighbors hogroaster (roughly 4.5' x 2' x 6") had been carried out of their yard and into my cornfield where the remaining scraps were picked over. He said, "Well, you know, if your guy isn't on the books as a known offender, there really isn't anything you can do with prints-" And I went into Tommy Lee Jones, "Men-In-Black" mode and blurted out, "He's not a known offender Captain... He's not even a known
species..."
At this point, his face took on the aspect of a 4 year old boy lost in Wal-Mart, and I told him yes, I was looking for a sasquatch, and quickly reminded him of the handfull of reports in their own records from the '80s. Once he realized I was serious, and after I told him about Jimmy Chilcutt's work, he really opened up, and was telling all kinds of alternative things I could use to try lifting prints.
After dusting the entire pan, (powdered graphite, clear packing tape and index cards) I got a smeared oval shaped "print" that looked like it might have had dermals at one time, which I sent off to Det. Chilcutt, and am still waiting to hear yea or nay on.
So far, I've found (in all
two cases.

) that if you present yourself seriously, and can cut most of the popular arguments to ribbons at a moments notice, most people will listen with an open mind.
Cheers!
-Sarge