Teens did not die from M-CAT

Toxicology tests on two teenagers, whose deaths sparked the probe into the safety of mephedrone, or M-CAT, have shown they had not taken the drug.

At the time police said they believed Louis Wainwright, 18, and Nicholas Smith, 19, had taken the then legal substance.

The Labour government banned the substance, which killed one other person around the same time according to toxicology tests.