Thallium (Tl) belongs to the Group 3 - Boron Family of elements. In the new IUPAC grouping, The Boron family is now Group 13.
Page updated 2/25/2016. Carrier, clerk, mail handlers, and distribution associates are required to take and pass the 473 Postal Exam. Other applicants including motor vehicle operators, mechanic, clerical, electronic technician, machinist, and trades must also pass a written test.
DoD employers will need to determine which of their employees are Handlers Only and which employees are Certifiers/Packers. The Certifiers/Packers are the ones who truly need the DoD certification training (e.g. Transport of Biomedical Material Course or Medical Waste Transport Course).