Highly potent synthetic opioid drugs called nitazenes, which experts say can be many times more potent than heroin, have been linked to hundreds of deaths in the UK.
Records show some people are taking them by accident, as they are mixed in with other drugs as cheap substitutes.
The National Crime Agency (NCA) believes nitazenes are being smuggled into the UK through the post. Due to their strength, they can be secreted in small volumes in parcels.
New data obtained by BBC News shows almost all the deaths as a result of taking the substance were accidental, with Birmingham being a hotspot.
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