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The first UK police force to pilot its officers carrying a "life-saving" drug that can temporarily reverse overdose effects is widening the roll-out.

After 52 officers in Birmingham took part in a trial, West Midlands Police this week ran its first in-person training of police constables who patrol Walsall town centre.

It is the latest stage in plans to see Naloxone used across the entire force.

But officers' representatives say such a role is better left to paramedics.

West Midlands Police Federation says it is concerned a drug user could still die after an officer attends to them, leading to a lengthy and stressful investigation for its members.

UK Editor Katie Razzall reports and this report was produced by Sean Clare.