There are around 450, 000 dogs in Wales, but the Welsh government says evidence from a database of hospital admissions suggests more are becoming out of control.

BBC: Dog control law could mean training sessions for owners

Only identical twins share genetic profiles on all 20 alleles, so if you get a perfect match between the DNA you find at the scene and the DNA database profile, you have very strong evidence that the person in the database committed the crime.

FORBES: Criminal DNA databases get a constitutional stamp of approval

Criminal database records were introduced into evidence with the names of several of Valle's alleged targets.

CNN: Graphic e-mails read at New York cannibalism plot trial