Esteban Santiago allegedly opened fire in a baggage claim area after retrieving a handgun from his checked luggage in the airport's second Terminal.
Officials said it is still unclear why the shooter picked the Fort Lauderdale airport and what his motivation was to attack.
Broward County Sheriff Scott Israel appeared Sunday morning on the Local 10 News show "This Week In South Florida" to speak about the shooting.
He said Santiago told investigators that a chip was placed in his head by an agency.
"The CIA or some agency had put a chip in his head and they were programming him and they forced him to watch a video on ISIS, and that changed and (he) said he was paid a certain amount of money by ISIS an hour or two later, so at this point we really don't know," Israel said.
Attorney Marc J. Victor who represented Dr. Peter Steinmetz, who was arrested at Sky Harbor Airport for carrying his AR-15 Rifle peacefully and who was later cleared of all charges was interviewed about the shooting.
"There's no problem with peaceful, competent people carrying firearms anywhere," said Victor.