Are there any confidentiality issues with supplying law enforcement with pictures of detained juveniles to use as the dummies in a photo array?

I think you may have an issue. Only limited circumstances for law enforcement to take a pic under 58.002 and 58.0022. If taken for probation department files, you have issue under 58.007(b).

I believe there are definite confidentiality issues with displaying photos of juveniles. Law enforcement officers I worked with in Midland came up with two options. If it is an older teen, you can often find young looking adult booking photos to use. For the younger teens, they would hand the witness the school yearbook to flip through.