The BioCheck(TM) Powder Screening Test Kit, manufactured by 2020Gene Systems, Inc. (website), is the primary test used by numerous US and international governmental agencies and hazmat units to determine if a powdered substance is possibly a hazardous biological material. It makes an initial test for protein and if protein is detected it then tests the pH to determine if the powdered substance matches the profile of anthrax or ricin toxin.
References
Hazardous powders testing kit Wikipedia(Text) CC BY-SA