Following a report on the growing problem of opioid addiction in the US two years ago, returning to find out what happened to the people met along the notorious I-95.
A US paramedic and author on why US opioid deaths have skyrocketed during the Covid pandemic.
BBC South West
Police in south Devon are warning drug users to "not gamble with your health" after being made aware that heroin which had been mixed with the opioid fentanyl had been reported in Torbay.
Torbay Police said on Facebook said the synthetic opioid was deadly "because it’s so much stronger than heroin and is up to 100 times more potent than morphine".
They added that drug users "generally don’t know when their heroin is laced with fentanyl, so when they inject their usual quantity of heroin, they can inadvertently take a deadly dose of the substance".
Officers also said fentanyl sold on the street was "almost always made in a clandestine lab", meaning its effect on the body "can be more unpredictable".
By Rachel Schraer
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BBC News NI
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BBC music reporter
By Vicky Baker
BBC News, New York
'I knew he was dead' A mum who found her son overdosing on drugs he brought on the dark web has spoken about her family's devastation. has spoken
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A surge in cocaine deaths is being blamed on fentanyl, a synthetic opioid far stronger than morphine.
By Georgina Rannard
BBC News, Washington
Authorities have seized enough fentanyl to kill every American. It's a crisis that lines one major highway.
By Reality Check team