Florida Statutes Title XXIII. Motor Vehicles § 316.1905. Electrical, mechanical, or other speed calculating devices; power of arrest; evidence

(3)(a) A witness otherwise qualified to testify shall be competent to give testimony against an accused violator of the motor vehicle laws of this state when such testimony is derived from the use of such an electronic, electrical, mechanical, or other device used in the calculation of speed, upon showing that the speed calculating device which was used had been tested. However, the operator of any visual average speed computer device shall first be certified as a competent operator of such device by the department.

(b) Upon the production of a certificate, signed and witnessed, showing that such device was tested within the time period specified and that such device was working properly, a presumption is established to that effect unless the contrary shall be established by competent evidence.

(c) Any person accused pursuant to the provisions of this section shall be entitled to have the officer actually operating the device appear in court and testify upon oral or written motion.