Well, upon urging from SlickSnake, I searched for cremated remains and hazardous materials and came up empty.
What I did find is that cremated remains are NOT considered hazardous materials by the USPS and can be mailed anywhere, anytime. It is considered a restricted material vs. a hazardous material, but only because of the various states' requirements for delivery only to the "authorizing agent" who is responsible for authorizing the remains to be cremated in the first place....family member, etc.
Now, while I didn't search every single state, I did get North Carolina, Oregon, Utah and Montana, and in none of those states are remains considered hazardous.
What they do speak to over and over are inclusions within the body that may be hazardous....pacemakers and the like. Other than that, no mention of the remains, after complete cremation, having to be considered hazardous, which is the subject here. I have noticed SS is mixing the requirements for cremation and what's being talked about....when the relatives receive the cremated remains, two completely different subjects.
Oregon, interestingly, has addressed scattering of remains.
Parts are quoted here:
OREGON MORTUARY AND CEMETERY BOARD
NOTICE
TO: INTERESTED PARTIES
FROM: DAVID KOACH, EXECUTIVE DIRECTOR
DATE: JULY 26, 2007
SUBJECT: SCATTERING CREMATED HUMAN REMAINS
Processed cremated human remains, sometimes called ashes, are a sanitary natural substance. There are no specific statutory restrictions on scattering cremated remains. Oregon law is silent on the matter. The only applicable administrative rule provides that when cremated remains are scattered by a funeral home, as opposed to the family, the ID tag must be made part of the funeral home's permanent record.
Although there are state and federal land, air and water pollution standards, such environmental quality laws make no specific mention of cremated remains - which are just the mineral content of bone that is not consumed in the cremation process. Once processed to remove metal and reduce bone fragments to unrecognizable dimensions, cremated remains are for all intents and purposes non-toxic, non-hazardous, non-polluting.
From this .pdf:
http://www.oregon.gov/MortCem/Consumer_Information/Scattering.pdf?ga=t
Kinda says what the majority are saying.....absolutely no danger, no toxicity, nothing. Even the EPA doesn't classifly remains as toxic, and the USPS doesn't classify remains as hazardous, either.
Onus is on SlickSnake to now back up his version of reality.