Family laments legal high death
9 January 2014 Last updated at 21:20 GMT
A former government drugs advisor has said policing so-called "legal highs" is an impossible task.
Dr Les King's comments come as one family tries to come to terms with the loss of their only son who died after taking a substance called AMT.
The number of people to die from legal highs rose to 52 last year - an average of one every week.