The USPS' Domestic Mail Manual, C023, as well as Department of Transportation (D.O.T.) have certain requirements and restrictions for mailing or shipping hazardous pharmaceuticals to patients (i.e. consumer commodities that are hazardous).
USPS also has regulations pertaining to mailing sharps, biological specimens, and other healthcare related materials.
Visit the USPS web site and reference the Domestic Mail Manual at (http://pe.usps.gov/) for more information.
Editor's Note: Maybe the solution is to use less toxic substances in our everyday life!