Tissue samples from living and post-mortem cases involving severe tissue infection should receive additional treatment.

BBC: Killer heroin report published

Police forces have been given lists of offenders living in their areas and will work though them to collect the samples.

BBC: A DNA autoradiogram

The FBI removed evidence including DNA samples from the house where the widow of suspected Boston Marathon bomber Tamerlan Tsarnaev has been living.

BBC: Tsarnaev widow's family home searched by FBI