Former NSW crime fighter Mark Standen has been found guilty of plotting to import 300 kilograms of pseudoephedrine into Australia.

Standen, 54, was also found guilty of taking part in the supply of 300 kilograms of the substance, which is used in the manufacture of illegal amphetamine drugs, and guilty of conspiring to pervert the course of justice.

Mark Standen is led away from the NSW Supreme Court after being found guilty of involvement in a drug importation plot. Credit:Brendan Esposito

After a trial that began in March, the NSW Supreme Court jury retired on Monday afternoon and delivered its verdicts today.

Standen, a former assistant director of investigations for the NSW Crime Commission had denied conspiring with drug trafficker turned informant James Kinch and food wholesaler Bakhos "Bill" Jalalaty, between early 2006 and June 2008, to import pseudoephedrine, used to make speed and ice.