I need a digital expert to dispute a criminal charge

I need a digital expert to dispute a criminal felony charge in Collin County Texas, USA. The charge is possession of child pornography >500. I need to dispute the amount of images for a defendant. You must be an expert so that your testimony is valid and able to be used in a court of law.

More details:

Is this project for business or personal use? Criminal court case
What information should successful freelancers include in their application? Experience
How soon do you need your project completed? ASAP