Deputies say a call came in from an apartment complex on Spiral Road that a teenager's cell phone had been stolen.
Agents say once they investigated the case, they realized marijuana was involved.
TCSO says 19-year-old Frank Coston was going to buy the drugs from the minor when he decided he didn't want to pay for them - then pulled out a gun.
Coston faces numerous charges including armed robbery.
Both he and the teen are charged with marijuana possession with intent to distribute.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or firstname.lastname@example.org.