The Ministry for Primary Industries has carried out more than 100,000 tests since a threat to contaminate infant formula but none has detected any trace of 1080, it says.
It is almost a fortnight since the deadline imposed by a blackmailer threatening to contaminate infant formula with the pesticide.
The ministry began its testing in mid-January, after the threat was made.
It said all infant and other formula products were as safe now as they were before the blackmail threat.
Police said they were still investigating, and urged the public to remain vigilant and report anything suspicious.