Paul Crowther, deputy chief constable of British Transport Police said: "The new laws that come into place today change a number of issues in respect of scrap metal. First of all it increases the sentences that are available under the existing legislation.
"It provides powers to the police to end unlicensed scrap metal dealers for the first time and introduces a new criminal offence of trading in cash for metal, which is a very significant measure in tackling metal theft at the point where it's sold into scrap metal yards."
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"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.