Officer Deyo testified that he tested the laser speed gun according to the manufacturer's specifications and found it to be working properly. However, when questioned, Officer Deyo was vague about the number and type of tests performed and the service history of the unit. The judge ruled that Officer Deyo's testimony regarding the testing procedures was manifestly unreliable, as he could not state the required number of tests or their names and procedures. Therefore, the prosecution failed to prove a prima facie case and the charge against Bruno Cuccarolo of speeding was dismissed.