It is absolutely evidence, but the evidence isn’t conclusive and doesn’t prove anything by itself. If you can get someone to testify that they are in the picture and what date it is, you have a stronger case.
At the very least, if the person in the photo is underage at that time, you can paint a pretty damning picture for the right jury. Furthermore if the person in the photo is underage and testifies to sexual conduct, you have an extremely good case because the fact that there is a picture of them together gives her immense credibility. I’m not a lawyer but I’m pretty sure sexual conduct with a minor has always been sexual assault and illegal so…
Nano