A hearing took place in Kidlington today.
PC Shaun Heyns gave two hair samples as part of an application to transfer forces in June last year.
The hearing concluded that PC Heyns had breached the Standards of Professional Behaviour in respect of Honesty and Integrity and Discreditable Conduct between 1 January 2018 and 25 June 2018. No breach in respect of Fitness for Duty was proven.
The former officer was based in Oxford Local Policing but resigned from his role with effect yesterday.
Deputy Chief Constable John Campbell said: "This hearing concluded that PC Heyns’ did not act with integrity, and had he not resigned, PC Heyns’ discreditable conduct –taking illegal drugs - would have resulted in him being dismissed from the force with immediate effect."