Any time someone begins a story with
> There are reports
and gives not one reference or link, I usually translate these as "Rumors, with no basis whatsoever in fact, spread by people too lazy to bother to check the truth, continue to state..."
Note that the OP does not give any description of this "person," not even that person's ethnic background, height, or general build. Not much to go on!
Are there people who take advantage of naive, trusting people? Yes, in every place, whether in major cities or in wilderness. You should be cautious about someone offering you free liquor ANYWHERE, whether it's on the Trail or at a bar a block from your home.
Can I prove that there ISN'T someone doing this in the area (which IS a bit wide, don't you think)?
No more than anyone can prove I HAVEN'T read War and Peace. Proving a negative is usually next to impossible.
But the utter vagueness of this description of this "person," as well as the wideness of the location of his supposed residence (he takes people to his home, which is somewhere between northern Virginia and Maryland), can't help me conclude this is another urban legend, on par with
http://www.snopes.com/crime/warnings/perfume.asp