Cadbury withdrew two varieties of its chocolate snacks from sale in Malaysia last week after government tests found traces of pork in them, leading some Islamic groups to call for a boycott on all of its products.
Malaysia's Islamic Development Department (Jakim) said none of the 11 samples it tested of Cadbury's Dairy Milk Hazelnut, Cadbury Dairy Milk Roast Almond and other products from the company's factory had shown positive results for porcine DNA.
Jakim said in a statement that Cadbury's halal certification for the two products would remain suspended pending further tests and investigations of its supply chain.
Jakim is the only body in Malaysia tasked with ensuring products are halal. The previous tests were conducted in February by the country's health ministry on products taken from store shelves.
Jakim had said those tests might not have been fair to Cadbury since the products could have been contaminated after leaving the factory.