cca05646_an_Board_of_Industrial_Hygiene__You_may_do_so_by
[If you decertified] For any reason except an ethics sanction [And you want to reactivate] At any time [You may do so by] 
Examination* if you: submit the CM By Exam form complete at least 2 hours of ethics training within the previous 60 months pay re-application & examination fees
Reactivation | American Board of Industrial Hygiene
You may do so by