What can automatically suspend a controlled substances registration?

The correct answer is moving out of South Dakota without notifying the secretary because, according to the regulations governing controlled substances registrations, maintaining an active registration is contingent on the registrant's address being current with the state authority. If a registrant relocates out of state and does not inform the secretary of that change, their registration can be automatically suspended since they are no longer eligible to hold a registration in South Dakota. This requirement ensures that only individuals who are physically present and practicing within the state maintain active registrations.

The possibility of automatic suspension for this reason underscores the importance of keeping state authorities informed about one's residency status. Other options, while related to registration maintenance, do not have the same direct consequence of automatic suspension based on existing regulations. For instance, failure to renew the registration every two years may lead to expiration, but it does not invoke an automatic suspension like the change of residency does. Similarly, changes in employment status and updates to email addresses are important for compliance and communication, but they do not trigger automatic suspension of the registration.