I don't believe it. For one thing, a common DNA test takes time, and is quite expensive. To selectively submit a mosquito as potential evidence in a stolen car case would have probably seen the officer written up for wasting department resources. Frankly, I suspect the officers had an idea who the thief was, and using good old interrogation skills, picked him up and convinced the subject that they have a mosquito (pulled from the car) with his DNA. Using this "irrefutable proof" as an interrogation tool, they get him to spill out and acknowledge other details that only the real theft would know; ie, they conned him into confessing. The mosquito would then be moot and not needed to convict. However, in order to allow for play of this gambit again, the cops are not letting on that the arthropod was imaginary.
