Adelaide drug mule Cassie Sainsbury has been sentenced to six years behind bars in Colombia after a judge rubber-stamped a plea deal.

Cassandra Sainsbury’s plea deal has been approved. #9News pic.twitter.com/Bb8YAxzrMm

— Nine News Australia (@9NewsAUS) November 1, 2017

Sainsbury was caught with 5.8kgs of cocaine in April as she tried to leave the country.

Sainsbury is teaching English inside the prison and with time already served, plus her work in jail, she could be released in as little as three years, the Nine Network reports.

AAP