TAMPA, Fla. -

A 52-year-old school Hillsborough County school bus driver has been fired after an investigation found she let her son drive the vehicle without students on board.

School officials voted Tuesday to fire Theresa Robinson after examining the video showing the young man driving.

The Tampa Bay Times reports that Robinson admitted she allowed her son to take the bus to have it cleaned and detailed on April 27.

Robinson says she was fired in retaliation for speaking out about problems in the department over the past few months. School district officials say retaliation had nothing to do with Robinson's firing.