Jacob Hoy, who was attacked while on duty, says ambulance staff need faster prosecutions.
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Scientists say the new method can diagnose the exact type of tumour within hours, rather than weeks.
The government wants universities to check the safety of halls and reach out to families after a death.
The treatment will be offered to those most at risk from August after a record number of cases.
Teenagers say it is easy to get hold of the products, which experts warn can be highly addictive.
Diana Johnson MP, who has campaigned with victims, tells BBC slow progress is "disappointing".
Diana Johnson MP, who has campaigned with victims, tells BBC slow progress is "disappointing".
Roya Rasouli, 27, promised herself on her hospital bed to share her story and is urging others to also.
Eight months into England's first public inquiry into mental health deaths, what have we learnt?
Eight months into England's first public inquiry into mental health deaths, what have we learnt?