The Government is expected to announce a new regime for party pills and fake cannabis which will require makers to prove their products are safe before they can be put on the market.
Associate Health Minister Peter Dunne is due to announce the new measure today - a change to the current law under which such untested products can be sold unless proven to be harmful, as happened with Kronic.
The change was recommended by a 2011 Law Commission report on the Misuse of Drugs Act.
At the time Mr Dunne said the change would take some time because it was a complex area and set up temporary 12-month bans on substances for which the health risks were unknown. That resulted in about 50 synthetic cannabis products being taken off the market - as well as some weight loss and sports performance supplements.
Yesterday Labour drugs spokesman Iain Lees-Galloway welcomed the change, but hoped it was just the start of a complete overhaul of the Misuse of Drugs Act 1975 as the Law Commission had proposed.