When service of process was first established it was performed by sheriffs or deputies, and agents of the court. This became very challenging and a burden to those authorized to serve process. They realized that they alone could not handle all the services that needed to be served and this is how Private Process Serving came about.
In Florida, a Certified Process Server is either Certified by the Chief Judge or appointed by the Sheriff in that county. In Florida, the Process Servers are tested each year or have to attend a few hours of education in order to renew their licenses. In Miami-Dade County we are required to also have a yearly bond that we provide the Court. The Miami-Dade County Courthouse has a designated Director for the Process Serving Division and they are responsible for every aspect relating to licensed Process Servers in Miami-Dade County.

Other states across the country have similar programs established. Each state is separate and has their own rules on Service of Process and the appointment of Process Servers in their States.