The American Spice Trade Association (ASTA) has always gone to great lengths to provide programs thats assist its many members. One of these programs is the Good Manufacturing Practice Guide. It is published to set standards with the hopes of assuring that all spices sold to food processors and consumers are safe and wholesome.
This guide focuses specifically on the spice manufacturing environment, and combines recommendations and best practices from ASTA member companies. To quote the ASTA website:
As with any agricultural product, safety, quality, and consistency of a spice product may be compromised by one or all of the many processes it undergoes between the farm and table.