The Florida Department of Health has placed a top official on administrative leave after he criticised staff over their vaccination rate.
In an email on 4 January, Dr Raul Pino called unvaccinated staff members "irresponsible" and wrote "we are not even at 50% - pathetic".
Legislation passed in Florida late last year prohibits employers, public and private, from mandating jabs.
DOH confirmed on Wednesday the doctor's actions were being investigated.
"As the decision to get vaccinated is a personal medical choice that should be made free from coercion and mandates from employers, the employee in question has been placed on administrative leave, and the Florida Department of Health is conducting an inquiry to determine if any laws were broken in this case," a spokesperson said in a statement to the BBC.
"The Department is committed to upholding all laws, including the ban on vaccine mandates for government employees and will take appropriate action once additional information is known."
Let's call them the Dept of Death