Organisers of this summer's music festivals were urged to warn revellers about the dangers of so-called "legal highs".
Minister for Crime Prevention James Brokenshire wrote to festival organisers to help spread the message that what is marketed as a "safe" drug could be highly dangerous.
He said: "During the festival season we know that people may be tempted to try potentially dangerous new drugs, particularly when they are advertised as 'legal' or 'herbal'.
"That is why we are asking festival organisers and police to work with us to send out the message that these substances may not be safe and could contain illegal drugs.
"We are going to change our drug laws so we can respond quickly to emerging substances by introducing a temporary ban while we seek full scientific advice."
Some drugs previously sold as "legal highs" were banned, including mephedrone, now a Class B drug.
Source: The Belfast Telegraph, 21/06/2010