Media playback is unsupported on your device

Police warning on 'legal highs' at work

5 September 2013 Last updated at 10:10 BST

A survey of Welsh employers has found one in three do not know how to tell if their workers are under the influence of recreational drugs.

It comes amid growing concern about the level of new-style drugs and so-called legal highs across Wales.

Police chiefs and drugs agencies have been worried about the rise in the use of mephedrone in Wales.

Det Ch Insp Martin Tavener has just retired as head of the regional crime unit. He told BBC Wales economics correspondent Sarah Dickins the drug had become a particular issue in Wales and was used by workers across a whole range of occupations.

Most watched

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.