Errr, not quite Pete.
A lone officer may prosecute for speeding provided that there is some form of corroboration of the officer's opinion that the subject was driving in excess of the stated speed limit,that corroboration can be a laser, vascar, muniquip, truvelo, vehicle speedometer etc. There is no need for electronic or photographic proof although some of the systems in use will provide this.
Sorry if this doesn't help your case..........