Three of the four people arrested yesterday following a search operation in Finglas in Dublin have been released without charge.
Gardaí carried out a series of searches at two houses yesterday morning.
A man in his 30s and two women in their 20s who were arrested have now been released.
Gardaí said files are being prepared for the Director of Public Prosecutions.
A man in his 20s is still being detained at Finglas Garda Station under Section 30 of the Offences Against Act, 1939.