Its from the 90s or early 2000s
I remember chikdren walking down a train or tram track and finding a dead body. One of the kids touch the body and their dna is on the body.
The movie is about a court case, we know the children are innocent but it looks like they are not.
There is one over zealous police man who takes a child out for a soda and when the chikd finishes he take she soda out of the bin and uses the dna to set him up.