I always liked it when guys used to carry their own "camcorders" or better yet, one they stole in the commission of their crimes to record and document their criminal activities...Better than an eyewitness.
The court will no doubt see the video he made, let him contest the method used to assess his speed all he wants...lol.
When they document their own stupidity like this, they are doing a cops job for him...lol...lol.