Since I retired in 2000 they created a new Safety & Security Division and pulled people to staff it from Airside Ops, Terminal Ops and Landside Ops. They now man the access gates and conduct perimeter patrols instead of Airside Ops Access Control personnel. It's a complete reversal of what they did in 1984 when they abolished the Security Division and put all their employees into Airside, Terminal and Landside. What goes around comes around I guess. The employees are airport employees and not police officers.
A retired Miami-Dade police captain is the head of the division and his name is Mark Forare. I believe you can find his office telephone number in the local Miami phone book in the government section under Miami-Dade County and then under Aviation Department. I can't find my phone book right now. A photo of Forare is at http://www.pbase.com/airlinerphotos/image/20804375
The employee's failure to give his name is against department rules, along with failure to give out the phone number and location of the Security office upon request. If you want to visit the top-secret classified office, go to the Hotel MIA
lobby on the second floor at Concourse E and the directory of offices is on the wall by the set of elevators closest to the Information Counter (not the Hotel elevators). I don't know what floor his office is on because I haven't been in the terminal in years except for retirement parties and those were held in the hotel bar upstairs.