Things like voice comparison evidence, the use of images for identification purposes, other types of evidence like prints, footprints on carpet - there is very little in the way of testing of those practices and we know very little about their value as evidence.
Controversial X-ray method sparks detention concerns
http://www.abc.net.au/news/2011-11-08/indonesian-children-in-australian-jails/3651282
A lawyer says up to 30 Indonesian children may be locked up in Australian jails after a controversial X-ray method used by Australian Federal Police (AFP) declared they were adults.
