Final answer:
Intoximeter training frequency varies by jurisdiction and agency policy, typically requiring regular refresher courses or re-certification at intervals that could be annual or biannual.
Step-by-step explanation:
After the first training on the intoximeter instrument, the frequency of subsequent trainings varies depending on the jurisdiction and the specific policies of the law enforcement agency. It is common for there to be regular re-certification or refresher trainings to ensure that law enforcement personnel are up-to-date on the operation, maintenance, and legal considerations related to the use of intoximeter devices, which are used to measure blood alcohol content. These refresher trainings could be annual, biannual, or at different intervals specified by the agency's standard operating procedures or state regulations.